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1 # printf.m4 serial 25
2 dnl Copyright (C) 2003, 2007-2008 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
6
7 dnl Test whether the *printf family of functions supports the 'j', 'z', 't',
8 dnl 'L' size specifiers. (ISO C99, POSIX:2001)
9 dnl Result is gl_cv_func_printf_sizes_c99.
10
11 AC_DEFUN([gl_PRINTF_SIZES_C99],
12 [
13 AC_REQUIRE([AC_PROG_CC])
14 AC_REQUIRE([gl_AC_HEADER_STDINT_H])
15 AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
16 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
17 AC_CACHE_CHECK([whether printf supports size specifiers as in C99],
18 [gl_cv_func_printf_sizes_c99],
19 [
20 AC_TRY_RUN([
21 #include <stddef.h>
22 #include <stdio.h>
23 #include <string.h>
24 #include <sys/types.h>
25 #if HAVE_STDINT_H_WITH_UINTMAX
26 # include <stdint.h>
27 #endif
28 #if HAVE_INTTYPES_H_WITH_UINTMAX
29 # include <inttypes.h>
30 #endif
31 static char buf[100];
32 int main ()
33 {
34 #if HAVE_STDINT_H_WITH_UINTMAX || HAVE_INTTYPES_H_WITH_UINTMAX
35 buf[0] = '\0';
36 if (sprintf (buf, "%ju %d", (uintmax_t) 12345671, 33, 44, 55) < 0
37 || strcmp (buf, "12345671 33") != 0)
38 return 1;
39 #endif
40 buf[0] = '\0';
41 if (sprintf (buf, "%zu %d", (size_t) 12345672, 33, 44, 55) < 0
42 || strcmp (buf, "12345672 33") != 0)
43 return 1;
44 buf[0] = '\0';
45 if (sprintf (buf, "%tu %d", (ptrdiff_t) 12345673, 33, 44, 55) < 0
46 || strcmp (buf, "12345673 33") != 0)
47 return 1;
48 buf[0] = '\0';
49 if (sprintf (buf, "%Lg %d", (long double) 1.5, 33, 44, 55) < 0
50 || strcmp (buf, "1.5 33") != 0)
51 return 1;
52 return 0;
53 }], [gl_cv_func_printf_sizes_c99=yes], [gl_cv_func_printf_sizes_c99=no],
54 [
55 changequote(,)dnl
56 case "$host_os" in
57 # Guess yes on glibc systems.
58 *-gnu*) gl_cv_func_printf_sizes_c99="guessing yes";;
59 # Guess yes on FreeBSD >= 5.
60 freebsd[1-4]*) gl_cv_func_printf_sizes_c99="guessing no";;
61 freebsd* | kfreebsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
62 # Guess yes on MacOS X >= 10.3.
63 darwin[1-6].*) gl_cv_func_printf_sizes_c99="guessing no";;
64 darwin*) gl_cv_func_printf_sizes_c99="guessing yes";;
65 # Guess yes on OpenBSD >= 3.9.
66 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
67 gl_cv_func_printf_sizes_c99="guessing no";;
68 openbsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
69 # Guess yes on Solaris >= 2.10.
70 solaris2.[0-9]*) gl_cv_func_printf_sizes_c99="guessing no";;
71 solaris*) gl_cv_func_printf_sizes_c99="guessing yes";;
72 # Guess yes on NetBSD >= 3.
73 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
74 gl_cv_func_printf_sizes_c99="guessing no";;
75 netbsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
76 # If we don't know, assume the worst.
77 *) gl_cv_func_printf_sizes_c99="guessing no";;
78 esac
79 changequote([,])dnl
80 ])
81 ])
82 ])
83
84 dnl Test whether the *printf family of functions supports 'long double'
85 dnl arguments together with the 'L' size specifier. (ISO C99, POSIX:2001)
86 dnl Result is gl_cv_func_printf_long_double.
87
88 AC_DEFUN([gl_PRINTF_LONG_DOUBLE],
89 [
90 AC_REQUIRE([AC_PROG_CC])
91 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
92 AC_CACHE_CHECK([whether printf supports 'long double' arguments],
93 [gl_cv_func_printf_long_double],
94 [
95 AC_TRY_RUN([
96 #include <stdio.h>
97 #include <string.h>
98 static char buf[10000];
99 int main ()
100 {
101 buf[0] = '\0';
102 if (sprintf (buf, "%Lf %d", 1.75L, 33, 44, 55) < 0
103 || strcmp (buf, "1.750000 33") != 0)
104 return 1;
105 buf[0] = '\0';
106 if (sprintf (buf, "%Le %d", 1.75L, 33, 44, 55) < 0
107 || strcmp (buf, "1.750000e+00 33") != 0)
108 return 1;
109 buf[0] = '\0';
110 if (sprintf (buf, "%Lg %d", 1.75L, 33, 44, 55) < 0
111 || strcmp (buf, "1.75 33") != 0)
112 return 1;
113 return 0;
114 }], [gl_cv_func_printf_long_double=yes], [gl_cv_func_printf_long_double=no],
115 [
116 changequote(,)dnl
117 case "$host_os" in
118 beos*) gl_cv_func_printf_long_double="guessing no";;
119 mingw* | pw*) gl_cv_func_printf_long_double="guessing no";;
120 *) gl_cv_func_printf_long_double="guessing yes";;
121 esac
122 changequote([,])dnl
123 ])
124 ])
125 ])
126
127 dnl Test whether the *printf family of functions supports infinite and NaN
128 dnl 'double' arguments in the %f, %e, %g directives. (ISO C99, POSIX:2001)
129 dnl Result is gl_cv_func_printf_infinite.
130
131 AC_DEFUN([gl_PRINTF_INFINITE],
132 [
133 AC_REQUIRE([AC_PROG_CC])
134 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
135 AC_CACHE_CHECK([whether printf supports infinite 'double' arguments],
136 [gl_cv_func_printf_infinite],
137 [
138 AC_TRY_RUN([
139 #include <stdio.h>
140 #include <string.h>
141 static int
142 strisnan (const char *string, size_t start_index, size_t end_index)
143 {
144 if (start_index < end_index)
145 {
146 if (string[start_index] == '-')
147 start_index++;
148 if (start_index + 3 <= end_index
149 && memcmp (string + start_index, "nan", 3) == 0)
150 {
151 start_index += 3;
152 if (start_index == end_index
153 || (string[start_index] == '(' && string[end_index - 1] == ')'))
154 return 1;
155 }
156 }
157 return 0;
158 }
159 static char buf[10000];
160 static double zero = 0.0;
161 int main ()
162 {
163 if (sprintf (buf, "%f", 1.0 / 0.0) < 0
164 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
165 return 1;
166 if (sprintf (buf, "%f", -1.0 / 0.0) < 0
167 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
168 return 1;
169 if (sprintf (buf, "%f", zero / zero) < 0
170 || !strisnan (buf, 0, strlen (buf)))
171 return 1;
172 if (sprintf (buf, "%e", 1.0 / 0.0) < 0
173 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
174 return 1;
175 if (sprintf (buf, "%e", -1.0 / 0.0) < 0
176 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
177 return 1;
178 if (sprintf (buf, "%e", zero / zero) < 0
179 || !strisnan (buf, 0, strlen (buf)))
180 return 1;
181 if (sprintf (buf, "%g", 1.0 / 0.0) < 0
182 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
183 return 1;
184 if (sprintf (buf, "%g", -1.0 / 0.0) < 0
185 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
186 return 1;
187 if (sprintf (buf, "%g", zero / zero) < 0
188 || !strisnan (buf, 0, strlen (buf)))
189 return 1;
190 return 0;
191 }], [gl_cv_func_printf_infinite=yes], [gl_cv_func_printf_infinite=no],
192 [
193 changequote(,)dnl
194 case "$host_os" in
195 # Guess yes on glibc systems.
196 *-gnu*) gl_cv_func_printf_infinite="guessing yes";;
197 # Guess yes on FreeBSD >= 6.
198 freebsd[1-5]*) gl_cv_func_printf_infinite="guessing no";;
199 freebsd* | kfreebsd*) gl_cv_func_printf_infinite="guessing yes";;
200 # Guess yes on MacOS X >= 10.3.
201 darwin[1-6].*) gl_cv_func_printf_infinite="guessing no";;
202 darwin*) gl_cv_func_printf_infinite="guessing yes";;
203 # Guess yes on HP-UX >= 11.
204 hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite="guessing no";;
205 hpux*) gl_cv_func_printf_infinite="guessing yes";;
206 # Guess yes on NetBSD >= 3.
207 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
208 gl_cv_func_printf_infinite="guessing no";;
209 netbsd*) gl_cv_func_printf_infinite="guessing yes";;
210 # Guess yes on BeOS.
211 beos*) gl_cv_func_printf_infinite="guessing yes";;
212 # If we don't know, assume the worst.
213 *) gl_cv_func_printf_infinite="guessing no";;
214 esac
215 changequote([,])dnl
216 ])
217 ])
218 ])
219
220 dnl Test whether the *printf family of functions supports infinite and NaN
221 dnl 'long double' arguments in the %f, %e, %g directives. (ISO C99, POSIX:2001)
222 dnl Result is gl_cv_func_printf_infinite_long_double.
223
224 AC_DEFUN([gl_PRINTF_INFINITE_LONG_DOUBLE],
225 [
226 AC_REQUIRE([gl_PRINTF_LONG_DOUBLE])
227 AC_REQUIRE([AC_PROG_CC])
228 AC_REQUIRE([AC_C_BIGENDIAN])
229 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
230 dnl The user can set or unset the variable gl_printf_safe to indicate
231 dnl that he wishes a safe handling of non-IEEE-754 'long double' values.
232 if test -n "$gl_printf_safe"; then
233 AC_DEFINE([CHECK_PRINTF_SAFE], 1,
234 [Define if you wish *printf() functions that have a safe handling of
235 non-IEEE-754 'long double' values.])
236 fi
237 case "$gl_cv_func_printf_long_double" in
238 *yes)
239 AC_CACHE_CHECK([whether printf supports infinite 'long double' arguments],
240 [gl_cv_func_printf_infinite_long_double],
241 [
242 AC_TRY_RUN([
243 ]GL_NOCRASH[
244 #include <float.h>
245 #include <stdio.h>
246 #include <string.h>
247 static int
248 strisnan (const char *string, size_t start_index, size_t end_index)
249 {
250 if (start_index < end_index)
251 {
252 if (string[start_index] == '-')
253 start_index++;
254 if (start_index + 3 <= end_index
255 && memcmp (string + start_index, "nan", 3) == 0)
256 {
257 start_index += 3;
258 if (start_index == end_index
259 || (string[start_index] == '(' && string[end_index - 1] == ')'))
260 return 1;
261 }
262 }
263 return 0;
264 }
265 static char buf[10000];
266 static long double zeroL = 0.0L;
267 int main ()
268 {
269 nocrash_init();
270 if (sprintf (buf, "%Lf", 1.0L / 0.0L) < 0
271 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
272 return 1;
273 if (sprintf (buf, "%Lf", -1.0L / 0.0L) < 0
274 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
275 return 1;
276 if (sprintf (buf, "%Lf", zeroL / zeroL) < 0
277 || !strisnan (buf, 0, strlen (buf)))
278 return 1;
279 if (sprintf (buf, "%Le", 1.0L / 0.0L) < 0
280 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
281 return 1;
282 if (sprintf (buf, "%Le", -1.0L / 0.0L) < 0
283 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
284 return 1;
285 if (sprintf (buf, "%Le", zeroL / zeroL) < 0
286 || !strisnan (buf, 0, strlen (buf)))
287 return 1;
288 if (sprintf (buf, "%Lg", 1.0L / 0.0L) < 0
289 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
290 return 1;
291 if (sprintf (buf, "%Lg", -1.0L / 0.0L) < 0
292 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
293 return 1;
294 if (sprintf (buf, "%Lg", zeroL / zeroL) < 0
295 || !strisnan (buf, 0, strlen (buf)))
296 return 1;
297 #if CHECK_PRINTF_SAFE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
298 /* Representation of an 80-bit 'long double' as an initializer for a sequence
299 of 'unsigned int' words. */
300 # ifdef WORDS_BIGENDIAN
301 # define LDBL80_WORDS(exponent,manthi,mantlo) \
302 { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
303 ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \
304 (unsigned int) (mantlo) << 16 \
305 }
306 # else
307 # define LDBL80_WORDS(exponent,manthi,mantlo) \
308 { mantlo, manthi, exponent }
309 # endif
310 { /* Quiet NaN. */
311 static union { unsigned int word[4]; long double value; } x =
312 { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
313 if (sprintf (buf, "%Lf", x.value) < 0
314 || !strisnan (buf, 0, strlen (buf)))
315 return 1;
316 if (sprintf (buf, "%Le", x.value) < 0
317 || !strisnan (buf, 0, strlen (buf)))
318 return 1;
319 if (sprintf (buf, "%Lg", x.value) < 0
320 || !strisnan (buf, 0, strlen (buf)))
321 return 1;
322 }
323 {
324 /* Signalling NaN. */
325 static union { unsigned int word[4]; long double value; } x =
326 { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
327 if (sprintf (buf, "%Lf", x.value) < 0
328 || !strisnan (buf, 0, strlen (buf)))
329 return 1;
330 if (sprintf (buf, "%Le", x.value) < 0
331 || !strisnan (buf, 0, strlen (buf)))
332 return 1;
333 if (sprintf (buf, "%Lg", x.value) < 0
334 || !strisnan (buf, 0, strlen (buf)))
335 return 1;
336 }
337 { /* Pseudo-NaN. */
338 static union { unsigned int word[4]; long double value; } x =
339 { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
340 if (sprintf (buf, "%Lf", x.value) < 0
341 || !strisnan (buf, 0, strlen (buf)))
342 return 1;
343 if (sprintf (buf, "%Le", x.value) < 0
344 || !strisnan (buf, 0, strlen (buf)))
345 return 1;
346 if (sprintf (buf, "%Lg", x.value) < 0
347 || !strisnan (buf, 0, strlen (buf)))
348 return 1;
349 }
350 { /* Pseudo-Infinity. */
351 static union { unsigned int word[4]; long double value; } x =
352 { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
353 if (sprintf (buf, "%Lf", x.value) < 0
354 || !strisnan (buf, 0, strlen (buf)))
355 return 1;
356 if (sprintf (buf, "%Le", x.value) < 0
357 || !strisnan (buf, 0, strlen (buf)))
358 return 1;
359 if (sprintf (buf, "%Lg", x.value) < 0
360 || !strisnan (buf, 0, strlen (buf)))
361 return 1;
362 }
363 { /* Pseudo-Zero. */
364 static union { unsigned int word[4]; long double value; } x =
365 { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
366 if (sprintf (buf, "%Lf", x.value) < 0
367 || !strisnan (buf, 0, strlen (buf)))
368 return 1;
369 if (sprintf (buf, "%Le", x.value) < 0
370 || !strisnan (buf, 0, strlen (buf)))
371 return 1;
372 if (sprintf (buf, "%Lg", x.value) < 0
373 || !strisnan (buf, 0, strlen (buf)))
374 return 1;
375 }
376 { /* Unnormalized number. */
377 static union { unsigned int word[4]; long double value; } x =
378 { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
379 if (sprintf (buf, "%Lf", x.value) < 0
380 || !strisnan (buf, 0, strlen (buf)))
381 return 1;
382 if (sprintf (buf, "%Le", x.value) < 0
383 || !strisnan (buf, 0, strlen (buf)))
384 return 1;
385 if (sprintf (buf, "%Lg", x.value) < 0
386 || !strisnan (buf, 0, strlen (buf)))
387 return 1;
388 }
389 { /* Pseudo-Denormal. */
390 static union { unsigned int word[4]; long double value; } x =
391 { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
392 if (sprintf (buf, "%Lf", x.value) < 0
393 || !strisnan (buf, 0, strlen (buf)))
394 return 1;
395 if (sprintf (buf, "%Le", x.value) < 0
396 || !strisnan (buf, 0, strlen (buf)))
397 return 1;
398 if (sprintf (buf, "%Lg", x.value) < 0
399 || !strisnan (buf, 0, strlen (buf)))
400 return 1;
401 }
402 #endif
403 return 0;
404 }],
405 [gl_cv_func_printf_infinite_long_double=yes],
406 [gl_cv_func_printf_infinite_long_double=no],
407 [
408 changequote(,)dnl
409 case "$host_cpu" in
410 # Guess no on ia64, x86_64, i386.
411 ia64 | x86_64 | i*86) gl_cv_func_printf_infinite_long_double="guessing no";;
412 *)
413 case "$host_os" in
414 # Guess yes on glibc systems.
415 *-gnu*) gl_cv_func_printf_infinite_long_double="guessing yes";;
416 # Guess yes on FreeBSD >= 6.
417 freebsd[1-5]*) gl_cv_func_printf_infinite_long_double="guessing no";;
418 freebsd* | kfreebsd*) gl_cv_func_printf_infinite_long_double="guessing yes";;
419 # Guess yes on MacOS X >= 10.3.
420 darwin[1-6].*) gl_cv_func_printf_infinite_long_double="guessing no";;
421 darwin*) gl_cv_func_printf_infinite_long_double="guessing yes";;
422 # Guess yes on HP-UX >= 11.
423 hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite_long_double="guessing no";;
424 hpux*) gl_cv_func_printf_infinite_long_double="guessing yes";;
425 # Guess yes on NetBSD >= 3.
426 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
427 gl_cv_func_printf_infinite_long_double="guessing no";;
428 netbsd*) gl_cv_func_printf_infinite_long_double="guessing yes";;
429 # If we don't know, assume the worst.
430 *) gl_cv_func_printf_infinite_long_double="guessing no";;
431 esac
432 ;;
433 esac
434 changequote([,])dnl
435 ])
436 ])
437 ;;
438 *)
439 gl_cv_func_printf_infinite_long_double="irrelevant"
440 ;;
441 esac
442 ])
443
444 dnl Test whether the *printf family of functions supports the 'a' and 'A'
445 dnl conversion specifier for hexadecimal output of floating-point numbers.
446 dnl (ISO C99, POSIX:2001)
447 dnl Result is gl_cv_func_printf_directive_a.
448
449 AC_DEFUN([gl_PRINTF_DIRECTIVE_A],
450 [
451 AC_REQUIRE([AC_PROG_CC])
452 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
453 AC_CACHE_CHECK([whether printf supports the 'a' and 'A' directives],
454 [gl_cv_func_printf_directive_a],
455 [
456 AC_TRY_RUN([
457 #include <stdio.h>
458 #include <string.h>
459 static char buf[100];
460 int main ()
461 {
462 if (sprintf (buf, "%a %d", 3.1416015625, 33, 44, 55) < 0
463 || (strcmp (buf, "0x1.922p+1 33") != 0
464 && strcmp (buf, "0x3.244p+0 33") != 0
465 && strcmp (buf, "0x6.488p-1 33") != 0
466 && strcmp (buf, "0xc.91p-2 33") != 0))
467 return 1;
468 if (sprintf (buf, "%A %d", -3.1416015625, 33, 44, 55) < 0
469 || (strcmp (buf, "-0X1.922P+1 33") != 0
470 && strcmp (buf, "-0X3.244P+0 33") != 0
471 && strcmp (buf, "-0X6.488P-1 33") != 0
472 && strcmp (buf, "-0XC.91P-2 33") != 0))
473 return 1;
474 /* This catches a FreeBSD 6.1 bug: it doesn't round. */
475 if (sprintf (buf, "%.2a %d", 1.51, 33, 44, 55) < 0
476 || (strcmp (buf, "0x1.83p+0 33") != 0
477 && strcmp (buf, "0x3.05p-1 33") != 0
478 && strcmp (buf, "0x6.0ap-2 33") != 0
479 && strcmp (buf, "0xc.14p-3 33") != 0))
480 return 1;
481 /* This catches a FreeBSD 6.1 bug. See
482 <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html> */
483 if (sprintf (buf, "%010a %d", 1.0 / 0.0, 33, 44, 55) < 0
484 || buf[0] == '0')
485 return 1;
486 /* This catches a MacOS X 10.3.9 (Darwin 7.9) bug. */
487 if (sprintf (buf, "%.1a", 1.999) < 0
488 || (strcmp (buf, "0x1.0p+1") != 0
489 && strcmp (buf, "0x2.0p+0") != 0
490 && strcmp (buf, "0x4.0p-1") != 0
491 && strcmp (buf, "0x8.0p-2") != 0))
492 return 1;
493 /* This catches the same MacOS X 10.3.9 (Darwin 7.9) bug and also a
494 glibc 2.4 bug <http://sourceware.org/bugzilla/show_bug.cgi?id=2908>. */
495 if (sprintf (buf, "%.1La", 1.999L) < 0
496 || (strcmp (buf, "0x1.0p+1") != 0
497 && strcmp (buf, "0x2.0p+0") != 0
498 && strcmp (buf, "0x4.0p-1") != 0
499 && strcmp (buf, "0x8.0p-2") != 0))
500 return 1;
501 return 0;
502 }], [gl_cv_func_printf_directive_a=yes], [gl_cv_func_printf_directive_a=no],
503 [
504 case "$host_os" in
505 # Guess yes on glibc >= 2.5 systems.
506 *-gnu*)
507 AC_EGREP_CPP([BZ2908], [
508 #include <features.h>
509 #ifdef __GNU_LIBRARY__
510 #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 5) || (__GLIBC__ > 2)
511 BZ2908
512 #endif
513 #endif
514 ],
515 [gl_cv_func_printf_directive_a="guessing yes"],
516 [gl_cv_func_printf_directive_a="guessing no"])
517 ;;
518 # If we don't know, assume the worst.
519 *) gl_cv_func_printf_directive_a="guessing no";;
520 esac
521 ])
522 ])
523 ])
524
525 dnl Test whether the *printf family of functions supports the %F format
526 dnl directive. (ISO C99, POSIX:2001)
527 dnl Result is gl_cv_func_printf_directive_f.
528
529 AC_DEFUN([gl_PRINTF_DIRECTIVE_F],
530 [
531 AC_REQUIRE([AC_PROG_CC])
532 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
533 AC_CACHE_CHECK([whether printf supports the 'F' directive],
534 [gl_cv_func_printf_directive_f],
535 [
536 AC_TRY_RUN([
537 #include <stdio.h>
538 #include <string.h>
539 static char buf[100];
540 int main ()
541 {
542 if (sprintf (buf, "%F %d", 1234567.0, 33, 44, 55) < 0
543 || strcmp (buf, "1234567.000000 33") != 0)
544 return 1;
545 if (sprintf (buf, "%F", 1.0 / 0.0) < 0
546 || (strcmp (buf, "INF") != 0 && strcmp (buf, "INFINITY") != 0))
547 return 1;
548 /* This catches a Cygwin 2007 bug. */
549 if (sprintf (buf, "%.F", 1234.0) < 0
550 || strcmp (buf, "1234") != 0)
551 return 1;
552 return 0;
553 }], [gl_cv_func_printf_directive_f=yes], [gl_cv_func_printf_directive_f=no],
554 [
555 changequote(,)dnl
556 case "$host_os" in
557 # Guess yes on glibc systems.
558 *-gnu*) gl_cv_func_printf_directive_f="guessing yes";;
559 # Guess yes on FreeBSD >= 6.
560 freebsd[1-5]*) gl_cv_func_printf_directive_f="guessing no";;
561 freebsd* | kfreebsd*) gl_cv_func_printf_directive_f="guessing yes";;
562 # Guess yes on MacOS X >= 10.3.
563 darwin[1-6].*) gl_cv_func_printf_directive_f="guessing no";;
564 darwin*) gl_cv_func_printf_directive_f="guessing yes";;
565 # Guess yes on Solaris >= 2.10.
566 solaris2.[0-9]*) gl_cv_func_printf_directive_f="guessing no";;
567 solaris*) gl_cv_func_printf_directive_f="guessing yes";;
568 # If we don't know, assume the worst.
569 *) gl_cv_func_printf_directive_f="guessing no";;
570 esac
571 changequote([,])dnl
572 ])
573 ])
574 ])
575
576 dnl Test whether the *printf family of functions supports the %n format
577 dnl directive. (ISO C99, POSIX:2001)
578 dnl Result is gl_cv_func_printf_directive_n.
579
580 AC_DEFUN([gl_PRINTF_DIRECTIVE_N],
581 [
582 AC_REQUIRE([AC_PROG_CC])
583 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
584 AC_CACHE_CHECK([whether printf supports the 'n' directive],
585 [gl_cv_func_printf_directive_n],
586 [
587 AC_TRY_RUN([
588 #include <stdio.h>
589 #include <string.h>
590 static char fmtstring[10];
591 static char buf[100];
592 int main ()
593 {
594 int count = -1;
595 /* Copy the format string. Some systems (glibc with _FORTIFY_SOURCE=2)
596 support %n in format strings in read-only memory but not in writable
597 memory. */
598 strcpy (fmtstring, "%d %n");
599 if (sprintf (buf, fmtstring, 123, &count, 33, 44, 55) < 0
600 || strcmp (buf, "123 ") != 0
601 || count != 4)
602 return 1;
603 return 0;
604 }], [gl_cv_func_printf_directive_n=yes], [gl_cv_func_printf_directive_n=no],
605 [
606 changequote(,)dnl
607 case "$host_os" in
608 *) gl_cv_func_printf_directive_n="guessing yes";;
609 esac
610 changequote([,])dnl
611 ])
612 ])
613 ])
614
615 dnl Test whether the *printf family of functions supports POSIX/XSI format
616 dnl strings with positions. (POSIX:2001)
617 dnl Result is gl_cv_func_printf_positions.
618
619 AC_DEFUN([gl_PRINTF_POSITIONS],
620 [
621 AC_REQUIRE([AC_PROG_CC])
622 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
623 AC_CACHE_CHECK([whether printf supports POSIX/XSI format strings with positions],
624 [gl_cv_func_printf_positions],
625 [
626 AC_TRY_RUN([
627 #include <stdio.h>
628 #include <string.h>
629 /* The string "%2$d %1$d", with dollar characters protected from the shell's
630 dollar expansion (possibly an autoconf bug). */
631 static char format[] = { '%', '2', '$', 'd', ' ', '%', '1', '$', 'd', '\0' };
632 static char buf[100];
633 int main ()
634 {
635 sprintf (buf, format, 33, 55);
636 return (strcmp (buf, "55 33") != 0);
637 }], [gl_cv_func_printf_positions=yes], [gl_cv_func_printf_positions=no],
638 [
639 changequote(,)dnl
640 case "$host_os" in
641 netbsd[1-3]* | netbsdelf[1-3]* | netbsdaout[1-3]* | netbsdcoff[1-3]*)
642 gl_cv_func_printf_positions="guessing no";;
643 beos*) gl_cv_func_printf_positions="guessing no";;
644 mingw* | pw*) gl_cv_func_printf_positions="guessing no";;
645 *) gl_cv_func_printf_positions="guessing yes";;
646 esac
647 changequote([,])dnl
648 ])
649 ])
650 ])
651
652 dnl Test whether the *printf family of functions supports POSIX/XSI format
653 dnl strings with the ' flag for grouping of decimal digits. (POSIX:2001)
654 dnl Result is gl_cv_func_printf_flag_grouping.
655
656 AC_DEFUN([gl_PRINTF_FLAG_GROUPING],
657 [
658 AC_REQUIRE([AC_PROG_CC])
659 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
660 AC_CACHE_CHECK([whether printf supports the grouping flag],
661 [gl_cv_func_printf_flag_grouping],
662 [
663 AC_TRY_RUN([
664 #include <stdio.h>
665 #include <string.h>
666 static char buf[100];
667 int main ()
668 {
669 if (sprintf (buf, "%'d %d", 1234567, 99) < 0
670 || buf[strlen (buf) - 1] != '9')
671 return 1;
672 return 0;
673 }], [gl_cv_func_printf_flag_grouping=yes], [gl_cv_func_printf_flag_grouping=no],
674 [
675 changequote(,)dnl
676 case "$host_os" in
677 cygwin*) gl_cv_func_printf_flag_grouping="guessing no";;
678 netbsd*) gl_cv_func_printf_flag_grouping="guessing no";;
679 mingw* | pw*) gl_cv_func_printf_flag_grouping="guessing no";;
680 *) gl_cv_func_printf_flag_grouping="guessing yes";;
681 esac
682 changequote([,])dnl
683 ])
684 ])
685 ])
686
687 dnl Test whether the *printf family of functions supports the - flag correctly.
688 dnl (ISO C99.) See
689 dnl <http://lists.gnu.org/archive/html/bug-coreutils/2008-02/msg00035.html>
690 dnl Result is gl_cv_func_printf_flag_leftadjust.
691
692 AC_DEFUN([gl_PRINTF_FLAG_LEFTADJUST],
693 [
694 AC_REQUIRE([AC_PROG_CC])
695 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
696 AC_CACHE_CHECK([whether printf supports the left-adjust flag correctly],
697 [gl_cv_func_printf_flag_leftadjust],
698 [
699 AC_TRY_RUN([
700 #include <stdio.h>
701 #include <string.h>
702 static char buf[100];
703 int main ()
704 {
705 /* Check that a '-' flag is not annihilated by a negative width. */
706 if (sprintf (buf, "a%-*sc", -3, "b") < 0
707 || strcmp (buf, "ab c") != 0)
708 return 1;
709 return 0;
710 }],
711 [gl_cv_func_printf_flag_leftadjust=yes],
712 [gl_cv_func_printf_flag_leftadjust=no],
713 [
714 changequote(,)dnl
715 case "$host_os" in
716 # Guess yes on HP-UX 11.
717 hpux11*) gl_cv_func_printf_flag_leftadjust="guessing yes";;
718 # Guess no on HP-UX 10 and older.
719 hpux*) gl_cv_func_printf_flag_leftadjust="guessing no";;
720 # Guess yes otherwise.
721 *) gl_cv_func_printf_flag_leftadjust="guessing yes";;
722 esac
723 changequote([,])dnl
724 ])
725 ])
726 ])
727
728 dnl Test whether the *printf family of functions supports padding of non-finite
729 dnl values with the 0 flag correctly. (ISO C99 + TC1 + TC2.) See
730 dnl <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html>
731 dnl Result is gl_cv_func_printf_flag_zero.
732
733 AC_DEFUN([gl_PRINTF_FLAG_ZERO],
734 [
735 AC_REQUIRE([AC_PROG_CC])
736 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
737 AC_CACHE_CHECK([whether printf supports the zero flag correctly],
738 [gl_cv_func_printf_flag_zero],
739 [
740 AC_TRY_RUN([
741 #include <stdio.h>
742 #include <string.h>
743 static char buf[100];
744 int main ()
745 {
746 if (sprintf (buf, "%010f", 1.0 / 0.0, 33, 44, 55) < 0
747 || (strcmp (buf, " inf") != 0
748 && strcmp (buf, " infinity") != 0))
749 return 1;
750 return 0;
751 }], [gl_cv_func_printf_flag_zero=yes], [gl_cv_func_printf_flag_zero=no],
752 [
753 changequote(,)dnl
754 case "$host_os" in
755 # Guess yes on glibc systems.
756 *-gnu*) gl_cv_func_printf_flag_zero="guessing yes";;
757 # Guess yes on BeOS.
758 beos*) gl_cv_func_printf_flag_zero="guessing yes";;
759 # If we don't know, assume the worst.
760 *) gl_cv_func_printf_flag_zero="guessing no";;
761 esac
762 changequote([,])dnl
763 ])
764 ])
765 ])
766
767 dnl Test whether the *printf family of functions supports large precisions.
768 dnl On mingw, precisions larger than 512 are treated like 512, in integer,
769 dnl floating-point or pointer output. On BeOS, precisions larger than 1044
770 dnl crash the program.
771 dnl Result is gl_cv_func_printf_precision.
772
773 AC_DEFUN([gl_PRINTF_PRECISION],
774 [
775 AC_REQUIRE([AC_PROG_CC])
776 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
777 AC_CACHE_CHECK([whether printf supports large precisions],
778 [gl_cv_func_printf_precision],
779 [
780 AC_TRY_RUN([
781 #include <stdio.h>
782 #include <string.h>
783 static char buf[5000];
784 int main ()
785 {
786 #ifdef __BEOS__
787 /* On BeOS, this would crash and show a dialog box. Avoid the crash. */
788 return 1;
789 #endif
790 if (sprintf (buf, "%.4000d %d", 1, 33, 44) < 4000 + 3)
791 return 1;
792 return 0;
793 }], [gl_cv_func_printf_precision=yes], [gl_cv_func_printf_precision=no],
794 [
795 changequote(,)dnl
796 case "$host_os" in
797 # Guess no only on native Win32 and BeOS systems.
798 mingw* | pw*) gl_cv_func_printf_precision="guessing no" ;;
799 beos*) gl_cv_func_printf_precision="guessing no" ;;
800 *) gl_cv_func_printf_precision="guessing yes" ;;
801 esac
802 changequote([,])dnl
803 ])
804 ])
805 ])
806
807 dnl Test whether the *printf family of functions recovers gracefully in case
808 dnl of an out-of-memory condition, or whether it crashes the entire program.
809 dnl Result is gl_cv_func_printf_enomem.
810
811 AC_DEFUN([gl_PRINTF_ENOMEM],
812 [
813 AC_REQUIRE([AC_PROG_CC])
814 AC_REQUIRE([gl_MULTIARCH])
815 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
816 AC_CACHE_CHECK([whether printf survives out-of-memory conditions],
817 [gl_cv_func_printf_enomem],
818 [
819 gl_cv_func_printf_enomem="guessing no"
820 if test "$cross_compiling" = no; then
821 if test $APPLE_UNIVERSAL_BUILD = 0; then
822 AC_LANG_CONFTEST([AC_LANG_SOURCE([
823 ]GL_NOCRASH[
824 changequote(,)dnl
825 #include <stdio.h>
826 #include <sys/types.h>
827 #include <sys/time.h>
828 #include <sys/resource.h>
829 #include <errno.h>
830 int main()
831 {
832 struct rlimit limit;
833 int ret;
834 nocrash_init ();
835 /* Some printf implementations allocate temporary space with malloc. */
836 /* On BSD systems, malloc() is limited by RLIMIT_DATA. */
837 #ifdef RLIMIT_DATA
838 if (getrlimit (RLIMIT_DATA, &limit) < 0)
839 return 77;
840 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
841 limit.rlim_max = 5000000;
842 limit.rlim_cur = limit.rlim_max;
843 if (setrlimit (RLIMIT_DATA, &limit) < 0)
844 return 77;
845 #endif
846 /* On Linux systems, malloc() is limited by RLIMIT_AS. */
847 #ifdef RLIMIT_AS
848 if (getrlimit (RLIMIT_AS, &limit) < 0)
849 return 77;
850 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
851 limit.rlim_max = 5000000;
852 limit.rlim_cur = limit.rlim_max;
853 if (setrlimit (RLIMIT_AS, &limit) < 0)
854 return 77;
855 #endif
856 /* Some printf implementations allocate temporary space on the stack. */
857 #ifdef RLIMIT_STACK
858 if (getrlimit (RLIMIT_STACK, &limit) < 0)
859 return 77;
860 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
861 limit.rlim_max = 5000000;
862 limit.rlim_cur = limit.rlim_max;
863 if (setrlimit (RLIMIT_STACK, &limit) < 0)
864 return 77;
865 #endif
866 ret = printf ("%.5000000f", 1.0);
867 return !(ret == 5000002 || (ret < 0 && errno == ENOMEM));
868 }
869 changequote([,])dnl
870 ])])
871 if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
872 (./conftest
873 result=$?
874 if test $result != 0 && test $result != 77; then result=1; fi
875 exit $result
876 ) >/dev/null 2>/dev/null
877 case $? in
878 0) gl_cv_func_printf_enomem="yes" ;;
879 77) gl_cv_func_printf_enomem="guessing no" ;;
880 *) gl_cv_func_printf_enomem="no" ;;
881 esac
882 else
883 gl_cv_func_printf_enomem="guessing no"
884 fi
885 rm -fr conftest*
886 else
887 dnl A universal build on Apple MacOS X platforms.
888 dnl The result would be 'no' in 32-bit mode and 'yes' in 64-bit mode.
889 dnl But we need a configuration result that is valid in both modes.
890 gl_cv_func_printf_enomem="guessing no"
891 fi
892 fi
893 if test "$gl_cv_func_printf_enomem" = "guessing no"; then
894 changequote(,)dnl
895 case "$host_os" in
896 # Guess yes on glibc systems.
897 *-gnu*) gl_cv_func_printf_enomem="guessing yes";;
898 # Guess yes on Solaris.
899 solaris*) gl_cv_func_printf_enomem="guessing yes";;
900 # Guess yes on AIX.
901 aix*) gl_cv_func_printf_enomem="guessing yes";;
902 # Guess yes on HP-UX/hppa.
903 hpux*) case "$host_cpu" in
904 hppa*) gl_cv_func_printf_enomem="guessing yes";;
905 *) gl_cv_func_printf_enomem="guessing no";;
906 esac
907 ;;
908 # Guess yes on IRIX.
909 irix*) gl_cv_func_printf_enomem="guessing yes";;
910 # Guess yes on OSF/1.
911 osf*) gl_cv_func_printf_enomem="guessing yes";;
912 # Guess yes on BeOS.
913 beos*) gl_cv_func_printf_enomem="guessing yes";;
914 # Guess yes on Haiku.
915 haiku*) gl_cv_func_printf_enomem="guessing yes";;
916 # If we don't know, assume the worst.
917 *) gl_cv_func_printf_enomem="guessing no";;
918 esac
919 changequote([,])dnl
920 fi
921 ])
922 ])
923
924 dnl Test whether the snprintf function exists. (ISO C99, POSIX:2001)
925 dnl Result is ac_cv_func_snprintf.
926
927 AC_DEFUN([gl_SNPRINTF_PRESENCE],
928 [
929 AC_CHECK_FUNCS_ONCE([snprintf])
930 ])
931
932 dnl Test whether the string produced by the snprintf function is always NUL
933 dnl terminated. (ISO C99, POSIX:2001)
934 dnl Result is gl_cv_func_snprintf_truncation_c99.
935
936 AC_DEFUN([gl_SNPRINTF_TRUNCATION_C99],
937 [
938 AC_REQUIRE([AC_PROG_CC])
939 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
940 AC_CACHE_CHECK([whether snprintf truncates the result as in C99],
941 [gl_cv_func_snprintf_truncation_c99],
942 [
943 AC_TRY_RUN([
944 #include <stdio.h>
945 #include <string.h>
946 static char buf[100];
947 int main ()
948 {
949 strcpy (buf, "ABCDEF");
950 snprintf (buf, 3, "%d %d", 4567, 89);
951 if (memcmp (buf, "45\0DEF", 6) != 0)
952 return 1;
953 return 0;
954 }], [gl_cv_func_snprintf_truncation_c99=yes], [gl_cv_func_snprintf_truncation_c99=no],
955 [
956 changequote(,)dnl
957 case "$host_os" in
958 # Guess yes on glibc systems.
959 *-gnu*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
960 # Guess yes on FreeBSD >= 5.
961 freebsd[1-4]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
962 freebsd* | kfreebsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
963 # Guess yes on MacOS X >= 10.3.
964 darwin[1-6].*) gl_cv_func_snprintf_truncation_c99="guessing no";;
965 darwin*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
966 # Guess yes on OpenBSD >= 3.9.
967 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
968 gl_cv_func_snprintf_truncation_c99="guessing no";;
969 openbsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
970 # Guess yes on Solaris >= 2.6.
971 solaris2.[0-5]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
972 solaris*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
973 # Guess yes on AIX >= 4.
974 aix[1-3]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
975 aix*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
976 # Guess yes on HP-UX >= 11.
977 hpux[7-9]* | hpux10*) gl_cv_func_snprintf_truncation_c99="guessing no";;
978 hpux*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
979 # Guess yes on IRIX >= 6.5.
980 irix6.5) gl_cv_func_snprintf_truncation_c99="guessing yes";;
981 # Guess yes on OSF/1 >= 5.
982 osf[3-4]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
983 osf*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
984 # Guess yes on NetBSD >= 3.
985 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
986 gl_cv_func_snprintf_truncation_c99="guessing no";;
987 netbsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
988 # Guess yes on BeOS.
989 beos*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
990 # If we don't know, assume the worst.
991 *) gl_cv_func_snprintf_truncation_c99="guessing no";;
992 esac
993 changequote([,])dnl
994 ])
995 ])
996 ])
997
998 dnl Test whether the return value of the snprintf function is the number
999 dnl of bytes (excluding the terminating NUL) that would have been produced
1000 dnl if the buffer had been large enough. (ISO C99, POSIX:2001)
1001 dnl For example, this test program fails on IRIX 6.5:
1002 dnl ---------------------------------------------------------------------
1003 dnl #include <stdio.h>
1004 dnl int main()
1005 dnl {
1006 dnl static char buf[8];
1007 dnl int retval = snprintf (buf, 3, "%d", 12345);
1008 dnl return retval >= 0 && retval < 3;
1009 dnl }
1010 dnl ---------------------------------------------------------------------
1011 dnl Result is gl_cv_func_snprintf_retval_c99.
1012
1013 AC_DEFUN([gl_SNPRINTF_RETVAL_C99],
1014 [
1015 AC_REQUIRE([AC_PROG_CC])
1016 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1017 AC_CACHE_CHECK([whether snprintf returns a byte count as in C99],
1018 [gl_cv_func_snprintf_retval_c99],
1019 [
1020 AC_TRY_RUN([
1021 #include <stdio.h>
1022 #include <string.h>
1023 static char buf[100];
1024 int main ()
1025 {
1026 strcpy (buf, "ABCDEF");
1027 if (snprintf (buf, 3, "%d %d", 4567, 89) != 7)
1028 return 1;
1029 return 0;
1030 }], [gl_cv_func_snprintf_retval_c99=yes], [gl_cv_func_snprintf_retval_c99=no],
1031 [
1032 changequote(,)dnl
1033 case "$host_os" in
1034 # Guess yes on glibc systems.
1035 *-gnu*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1036 # Guess yes on FreeBSD >= 5.
1037 freebsd[1-4]*) gl_cv_func_snprintf_retval_c99="guessing no";;
1038 freebsd* | kfreebsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1039 # Guess yes on MacOS X >= 10.3.
1040 darwin[1-6].*) gl_cv_func_snprintf_retval_c99="guessing no";;
1041 darwin*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1042 # Guess yes on OpenBSD >= 3.9.
1043 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
1044 gl_cv_func_snprintf_retval_c99="guessing no";;
1045 openbsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1046 # Guess yes on Solaris >= 2.6.
1047 solaris2.[0-5]*) gl_cv_func_snprintf_retval_c99="guessing no";;
1048 solaris*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1049 # Guess yes on AIX >= 4.
1050 aix[1-3]*) gl_cv_func_snprintf_retval_c99="guessing no";;
1051 aix*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1052 # Guess yes on NetBSD >= 3.
1053 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1054 gl_cv_func_snprintf_retval_c99="guessing no";;
1055 netbsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1056 # Guess yes on BeOS.
1057 beos*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1058 # If we don't know, assume the worst.
1059 *) gl_cv_func_snprintf_retval_c99="guessing no";;
1060 esac
1061 changequote([,])dnl
1062 ])
1063 ])
1064 ])
1065
1066 dnl Test whether the snprintf function supports the %n format directive
1067 dnl also in truncated portions of the format string. (ISO C99, POSIX:2001)
1068 dnl Result is gl_cv_func_snprintf_directive_n.
1069
1070 AC_DEFUN([gl_SNPRINTF_DIRECTIVE_N],
1071 [
1072 AC_REQUIRE([AC_PROG_CC])
1073 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1074 AC_CACHE_CHECK([whether snprintf fully supports the 'n' directive],
1075 [gl_cv_func_snprintf_directive_n],
1076 [
1077 AC_TRY_RUN([
1078 #include <stdio.h>
1079 #include <string.h>
1080 static char fmtstring[10];
1081 static char buf[100];
1082 int main ()
1083 {
1084 int count = -1;
1085 /* Copy the format string. Some systems (glibc with _FORTIFY_SOURCE=2)
1086 support %n in format strings in read-only memory but not in writable
1087 memory. */
1088 strcpy (fmtstring, "%d %n");
1089 snprintf (buf, 4, fmtstring, 12345, &count, 33, 44, 55);
1090 if (count != 6)
1091 return 1;
1092 return 0;
1093 }], [gl_cv_func_snprintf_directive_n=yes], [gl_cv_func_snprintf_directive_n=no],
1094 [
1095 changequote(,)dnl
1096 case "$host_os" in
1097 # Guess yes on glibc systems.
1098 *-gnu*) gl_cv_func_snprintf_directive_n="guessing yes";;
1099 # Guess yes on FreeBSD >= 5.
1100 freebsd[1-4]*) gl_cv_func_snprintf_directive_n="guessing no";;
1101 freebsd* | kfreebsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
1102 # Guess yes on MacOS X >= 10.3.
1103 darwin[1-6].*) gl_cv_func_snprintf_directive_n="guessing no";;
1104 darwin*) gl_cv_func_snprintf_directive_n="guessing yes";;
1105 # Guess yes on Solaris >= 2.6.
1106 solaris2.[0-5]*) gl_cv_func_snprintf_directive_n="guessing no";;
1107 solaris*) gl_cv_func_snprintf_directive_n="guessing yes";;
1108 # Guess yes on AIX >= 4.
1109 aix[1-3]*) gl_cv_func_snprintf_directive_n="guessing no";;
1110 aix*) gl_cv_func_snprintf_directive_n="guessing yes";;
1111 # Guess yes on IRIX >= 6.5.
1112 irix6.5) gl_cv_func_snprintf_directive_n="guessing yes";;
1113 # Guess yes on OSF/1 >= 5.
1114 osf[3-4]*) gl_cv_func_snprintf_directive_n="guessing no";;
1115 osf*) gl_cv_func_snprintf_directive_n="guessing yes";;
1116 # Guess yes on NetBSD >= 3.
1117 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1118 gl_cv_func_snprintf_directive_n="guessing no";;
1119 netbsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
1120 # Guess yes on BeOS.
1121 beos*) gl_cv_func_snprintf_directive_n="guessing yes";;
1122 # If we don't know, assume the worst.
1123 *) gl_cv_func_snprintf_directive_n="guessing no";;
1124 esac
1125 changequote([,])dnl
1126 ])
1127 ])
1128 ])
1129
1130 dnl Test whether the snprintf function, when passed a size = 1, writes any
1131 dnl output without bounds in this case, behaving like sprintf. This is the
1132 dnl case on Linux libc5.
1133 dnl Result is gl_cv_func_snprintf_size1.
1134
1135 AC_DEFUN([gl_SNPRINTF_SIZE1],
1136 [
1137 AC_REQUIRE([AC_PROG_CC])
1138 AC_CACHE_CHECK([whether snprintf respects a size of 1],
1139 [gl_cv_func_snprintf_size1],
1140 [
1141 AC_TRY_RUN([
1142 #include <stdio.h>
1143 int main()
1144 {
1145 static char buf[8] = "DEADBEEF";
1146 snprintf (buf, 1, "%d", 12345);
1147 return buf[1] != 'E';
1148 }],
1149 [gl_cv_func_snprintf_size1=yes],
1150 [gl_cv_func_snprintf_size1=no],
1151 [gl_cv_func_snprintf_size1="guessing yes"])
1152 ])
1153 ])
1154
1155 dnl Test whether the vsnprintf function, when passed a zero size, produces no
1156 dnl output. (ISO C99, POSIX:2001)
1157 dnl For example, snprintf nevertheless writes a NUL byte in this case
1158 dnl on OSF/1 5.1:
1159 dnl ---------------------------------------------------------------------
1160 dnl #include <stdio.h>
1161 dnl int main()
1162 dnl {
1163 dnl static char buf[8] = "DEADBEEF";
1164 dnl snprintf (buf, 0, "%d", 12345);
1165 dnl return buf[0] != 'D';
1166 dnl }
1167 dnl ---------------------------------------------------------------------
1168 dnl And vsnprintf writes any output without bounds in this case, behaving like
1169 dnl vsprintf, on HP-UX 11 and OSF/1 5.1:
1170 dnl ---------------------------------------------------------------------
1171 dnl #include <stdarg.h>
1172 dnl #include <stdio.h>
1173 dnl static int my_snprintf (char *buf, int size, const char *format, ...)
1174 dnl {
1175 dnl va_list args;
1176 dnl int ret;
1177 dnl va_start (args, format);
1178 dnl ret = vsnprintf (buf, size, format, args);
1179 dnl va_end (args);
1180 dnl return ret;
1181 dnl }
1182 dnl int main()
1183 dnl {
1184 dnl static char buf[8] = "DEADBEEF";
1185 dnl my_snprintf (buf, 0, "%d", 12345);
1186 dnl return buf[0] != 'D';
1187 dnl }
1188 dnl ---------------------------------------------------------------------
1189 dnl Result is gl_cv_func_vsnprintf_zerosize_c99.
1190
1191 AC_DEFUN([gl_VSNPRINTF_ZEROSIZE_C99],
1192 [
1193 AC_REQUIRE([AC_PROG_CC])
1194 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1195 AC_CACHE_CHECK([whether vsnprintf respects a zero size as in C99],
1196 [gl_cv_func_vsnprintf_zerosize_c99],
1197 [
1198 AC_TRY_RUN([
1199 #include <stdarg.h>
1200 #include <stdio.h>
1201 static int my_snprintf (char *buf, int size, const char *format, ...)
1202 {
1203 va_list args;
1204 int ret;
1205 va_start (args, format);
1206 ret = vsnprintf (buf, size, format, args);
1207 va_end (args);
1208 return ret;
1209 }
1210 int main()
1211 {
1212 static char buf[8] = "DEADBEEF";
1213 my_snprintf (buf, 0, "%d", 12345);
1214 return buf[0] != 'D';
1215 }],
1216 [gl_cv_func_vsnprintf_zerosize_c99=yes],
1217 [gl_cv_func_vsnprintf_zerosize_c99=no],
1218 [
1219 changequote(,)dnl
1220 case "$host_os" in
1221 # Guess yes on glibc systems.
1222 *-gnu*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1223 # Guess yes on FreeBSD >= 5.
1224 freebsd[1-4]*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1225 freebsd* | kfreebsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1226 # Guess yes on MacOS X >= 10.3.
1227 darwin[1-6].*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1228 darwin*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1229 # Guess yes on Cygwin.
1230 cygwin*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1231 # Guess yes on Solaris >= 2.6.
1232 solaris2.[0-5]*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1233 solaris*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1234 # Guess yes on AIX >= 4.
1235 aix[1-3]*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1236 aix*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1237 # Guess yes on IRIX >= 6.5.
1238 irix6.5) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1239 # Guess yes on NetBSD >= 3.
1240 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1241 gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1242 netbsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1243 # Guess yes on BeOS.
1244 beos*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1245 # Guess yes on mingw.
1246 mingw* | pw*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1247 # If we don't know, assume the worst.
1248 *) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1249 esac
1250 changequote([,])dnl
1251 ])
1252 ])
1253 ])
1254
1255 dnl The results of these tests on various platforms are:
1256 dnl
1257 dnl 1 = gl_PRINTF_SIZES_C99
1258 dnl 2 = gl_PRINTF_LONG_DOUBLE
1259 dnl 3 = gl_PRINTF_INFINITE
1260 dnl 4 = gl_PRINTF_INFINITE_LONG_DOUBLE
1261 dnl 5 = gl_PRINTF_DIRECTIVE_A
1262 dnl 6 = gl_PRINTF_DIRECTIVE_F
1263 dnl 7 = gl_PRINTF_DIRECTIVE_N
1264 dnl 8 = gl_PRINTF_POSITIONS
1265 dnl 9 = gl_PRINTF_FLAG_GROUPING
1266 dnl 10 = gl_PRINTF_FLAG_LEFTADJUST
1267 dnl 11 = gl_PRINTF_FLAG_ZERO
1268 dnl 12 = gl_PRINTF_PRECISION
1269 dnl 13 = gl_PRINTF_ENOMEM
1270 dnl 14 = gl_SNPRINTF_PRESENCE
1271 dnl 15 = gl_SNPRINTF_TRUNCATION_C99
1272 dnl 16 = gl_SNPRINTF_RETVAL_C99
1273 dnl 17 = gl_SNPRINTF_DIRECTIVE_N
1274 dnl 18 = gl_SNPRINTF_SIZE1
1275 dnl 19 = gl_VSNPRINTF_ZEROSIZE_C99
1276 dnl
1277 dnl 1 = checking whether printf supports size specifiers as in C99...
1278 dnl 2 = checking whether printf supports 'long double' arguments...
1279 dnl 3 = checking whether printf supports infinite 'double' arguments...
1280 dnl 4 = checking whether printf supports infinite 'long double' arguments...
1281 dnl 5 = checking whether printf supports the 'a' and 'A' directives...
1282 dnl 6 = checking whether printf supports the 'F' directive...
1283 dnl 7 = checking whether printf supports the 'n' directive...
1284 dnl 8 = checking whether printf supports POSIX/XSI format strings with positions...
1285 dnl 9 = checking whether printf supports the grouping flag...
1286 dnl 10 = checking whether printf supports the left-adjust flag correctly...
1287 dnl 11 = checking whether printf supports the zero flag correctly...
1288 dnl 12 = checking whether printf supports large precisions...
1289 dnl 13 = checking whether printf survives out-of-memory conditions...
1290 dnl 14 = checking for snprintf...
1291 dnl 15 = checking whether snprintf truncates the result as in C99...
1292 dnl 16 = checking whether snprintf returns a byte count as in C99...
1293 dnl 17 = checking whether snprintf fully supports the 'n' directive...
1294 dnl 18 = checking whether snprintf respects a size of 1...
1295 dnl 19 = checking whether vsnprintf respects a zero size as in C99...
1296 dnl
1297 dnl . = yes, # = no.
1298 dnl
1299 dnl 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
1300 dnl glibc 2.5 . . . . . . . . . . . . . . . . . . .
1301 dnl glibc 2.3.6 . . . . # . . . . . . . . . . . . . .
1302 dnl FreeBSD 5.4, 6.1 . . . . # . . . . . # . # . . . . . .
1303 dnl MacOS X 10.3.9 . . . . # . . . . . # . # . . . . . .
1304 dnl OpenBSD 3.9, 4.0 . . # # # # . . # . # . # . . . . . .
1305 dnl Cygwin 2007 (= Cygwin 1.5.24) . . . . # # . . . ? # ? ? . . . . . .
1306 dnl Cygwin 2006 (= Cygwin 1.5.19) # . . . # # . . # ? # ? ? . . . . . .
1307 dnl Solaris 10 . . # # # . . . . . # . . . . . . . .
1308 dnl Solaris 2.6 ... 9 # . # # # # . . . . # . . . . . . . .
1309 dnl Solaris 2.5.1 # . # # # # . . . . # . . # # # # # #
1310 dnl AIX 5.2 . . # # # . . . . . # . . . . . . . .
1311 dnl AIX 4.3.2, 5.1 # . # # # # . . . . # . . . . . . . .
1312 dnl HP-UX 11.31 . . . . # . . . . . # . . . . # # . .
1313 dnl HP-UX 11.{00,11,23} # . . . # # . . . . # . . . . # # . #
1314 dnl HP-UX 10.20 # . . . # # . . . # # . . . . # # ? #
1315 dnl IRIX 6.5 # . # # # # . . . . # . . . . # . . .
1316 dnl OSF/1 5.1 # . # # # # . . . . # . . . . # . . #
1317 dnl OSF/1 4.0d # . # # # # . . . . # . . # # # # # #
1318 dnl NetBSD 4.0 . ? ? ? ? ? . . ? ? ? ? ? . . . ? ? ?
1319 dnl NetBSD 3.0 . . . . # # . # # ? # . # . . . . . .
1320 dnl Haiku . . . # # # . . . . . . ? . . . . . .
1321 dnl BeOS # # . # # # . # . ? . # ? . . . . . .
1322 dnl mingw # # # # # # . # # . # # ? . # # # . .