2 dnl Copyright (C) 2003, 2007-2011 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.
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.
11 AC_DEFUN([gl_PRINTF_SIZES_C99],
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],
25 #include <sys/types.h>
26 #if HAVE_STDINT_H_WITH_UINTMAX
29 #if HAVE_INTTYPES_H_WITH_UINTMAX
30 # include <inttypes.h>
36 #if HAVE_STDINT_H_WITH_UINTMAX || HAVE_INTTYPES_H_WITH_UINTMAX
38 if (sprintf (buf, "%ju %d", (uintmax_t) 12345671, 33, 44, 55) < 0
39 || strcmp (buf, "12345671 33") != 0)
43 if (sprintf (buf, "%zu %d", (size_t) 12345672, 33, 44, 55) < 0
44 || strcmp (buf, "12345672 33") != 0)
47 if (sprintf (buf, "%tu %d", (ptrdiff_t) 12345673, 33, 44, 55) < 0
48 || strcmp (buf, "12345673 33") != 0)
51 if (sprintf (buf, "%Lg %d", (long double) 1.5, 33, 44, 55) < 0
52 || strcmp (buf, "1.5 33") != 0)
56 [gl_cv_func_printf_sizes_c99=yes],
57 [gl_cv_func_printf_sizes_c99=no],
61 # Guess yes on glibc systems.
62 *-gnu*) gl_cv_func_printf_sizes_c99="guessing yes";;
63 # Guess yes on FreeBSD >= 5.
64 freebsd[1-4]*) gl_cv_func_printf_sizes_c99="guessing no";;
65 freebsd* | kfreebsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
66 # Guess yes on MacOS X >= 10.3.
67 darwin[1-6].*) gl_cv_func_printf_sizes_c99="guessing no";;
68 darwin*) gl_cv_func_printf_sizes_c99="guessing yes";;
69 # Guess yes on OpenBSD >= 3.9.
70 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
71 gl_cv_func_printf_sizes_c99="guessing no";;
72 openbsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
73 # Guess yes on Solaris >= 2.10.
74 solaris2.[1-9][0-9]*) gl_cv_func_printf_sizes_c99="guessing yes";;
75 solaris*) gl_cv_func_printf_sizes_c99="guessing no";;
76 # Guess yes on NetBSD >= 3.
77 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
78 gl_cv_func_printf_sizes_c99="guessing no";;
79 netbsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
80 # If we don't know, assume the worst.
81 *) gl_cv_func_printf_sizes_c99="guessing no";;
88 dnl Test whether the *printf family of functions supports 'long double'
89 dnl arguments together with the 'L' size specifier. (ISO C99, POSIX:2001)
90 dnl Result is gl_cv_func_printf_long_double.
92 AC_DEFUN([gl_PRINTF_LONG_DOUBLE],
94 AC_REQUIRE([AC_PROG_CC])
95 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
96 AC_CACHE_CHECK([whether printf supports 'long double' arguments],
97 [gl_cv_func_printf_long_double],
103 static char buf[10000];
108 if (sprintf (buf, "%Lf %d", 1.75L, 33, 44, 55) < 0
109 || strcmp (buf, "1.750000 33") != 0)
112 if (sprintf (buf, "%Le %d", 1.75L, 33, 44, 55) < 0
113 || strcmp (buf, "1.750000e+00 33") != 0)
116 if (sprintf (buf, "%Lg %d", 1.75L, 33, 44, 55) < 0
117 || strcmp (buf, "1.75 33") != 0)
121 [gl_cv_func_printf_long_double=yes],
122 [gl_cv_func_printf_long_double=no],
126 beos*) gl_cv_func_printf_long_double="guessing no";;
127 mingw* | pw*) gl_cv_func_printf_long_double="guessing no";;
128 *) gl_cv_func_printf_long_double="guessing yes";;
135 dnl Test whether the *printf family of functions supports infinite and NaN
136 dnl 'double' arguments and negative zero arguments in the %f, %e, %g
137 dnl directives. (ISO C99, POSIX:2001)
138 dnl Result is gl_cv_func_printf_infinite.
140 AC_DEFUN([gl_PRINTF_INFINITE],
142 AC_REQUIRE([AC_PROG_CC])
143 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
144 AC_CACHE_CHECK([whether printf supports infinite 'double' arguments],
145 [gl_cv_func_printf_infinite],
152 strisnan (const char *string, size_t start_index, size_t end_index)
154 if (start_index < end_index)
156 if (string[start_index] == '-')
158 if (start_index + 3 <= end_index
159 && memcmp (string + start_index, "nan", 3) == 0)
162 if (start_index == end_index
163 || (string[start_index] == '(' && string[end_index - 1] == ')'))
172 static double plus_zero = 0.0;
173 double minus_zero = - plus_zero;
174 return memcmp (&plus_zero, &minus_zero, sizeof (double)) != 0;
176 static char buf[10000];
177 static double zero = 0.0;
181 if (sprintf (buf, "%f", 1.0 / 0.0) < 0
182 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
184 if (sprintf (buf, "%f", -1.0 / 0.0) < 0
185 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
187 if (sprintf (buf, "%f", zero / zero) < 0
188 || !strisnan (buf, 0, strlen (buf)))
190 if (sprintf (buf, "%e", 1.0 / 0.0) < 0
191 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
193 if (sprintf (buf, "%e", -1.0 / 0.0) < 0
194 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
196 if (sprintf (buf, "%e", zero / zero) < 0
197 || !strisnan (buf, 0, strlen (buf)))
199 if (sprintf (buf, "%g", 1.0 / 0.0) < 0
200 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
202 if (sprintf (buf, "%g", -1.0 / 0.0) < 0
203 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
205 if (sprintf (buf, "%g", zero / zero) < 0
206 || !strisnan (buf, 0, strlen (buf)))
208 /* This test fails on HP-UX 10.20. */
209 if (have_minus_zero ())
210 if (sprintf (buf, "%g", - zero) < 0
211 || strcmp (buf, "-0") != 0)
215 [gl_cv_func_printf_infinite=yes],
216 [gl_cv_func_printf_infinite=no],
220 # Guess yes on glibc systems.
221 *-gnu*) gl_cv_func_printf_infinite="guessing yes";;
222 # Guess yes on FreeBSD >= 6.
223 freebsd[1-5]*) gl_cv_func_printf_infinite="guessing no";;
224 freebsd* | kfreebsd*) gl_cv_func_printf_infinite="guessing yes";;
225 # Guess yes on MacOS X >= 10.3.
226 darwin[1-6].*) gl_cv_func_printf_infinite="guessing no";;
227 darwin*) gl_cv_func_printf_infinite="guessing yes";;
228 # Guess yes on HP-UX >= 11.
229 hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite="guessing no";;
230 hpux*) gl_cv_func_printf_infinite="guessing yes";;
231 # Guess yes on NetBSD >= 3.
232 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
233 gl_cv_func_printf_infinite="guessing no";;
234 netbsd*) gl_cv_func_printf_infinite="guessing yes";;
236 beos*) gl_cv_func_printf_infinite="guessing yes";;
237 # If we don't know, assume the worst.
238 *) gl_cv_func_printf_infinite="guessing no";;
245 dnl Test whether the *printf family of functions supports infinite and NaN
246 dnl 'long double' arguments in the %f, %e, %g directives. (ISO C99, POSIX:2001)
247 dnl Result is gl_cv_func_printf_infinite_long_double.
249 AC_DEFUN([gl_PRINTF_INFINITE_LONG_DOUBLE],
251 AC_REQUIRE([gl_PRINTF_LONG_DOUBLE])
252 AC_REQUIRE([AC_PROG_CC])
253 AC_REQUIRE([gl_BIGENDIAN])
254 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
255 dnl The user can set or unset the variable gl_printf_safe to indicate
256 dnl that he wishes a safe handling of non-IEEE-754 'long double' values.
257 if test -n "$gl_printf_safe"; then
258 AC_DEFINE([CHECK_PRINTF_SAFE], [1],
259 [Define if you wish *printf() functions that have a safe handling of
260 non-IEEE-754 'long double' values.])
262 case "$gl_cv_func_printf_long_double" in
264 AC_CACHE_CHECK([whether printf supports infinite 'long double' arguments],
265 [gl_cv_func_printf_infinite_long_double],
274 strisnan (const char *string, size_t start_index, size_t end_index)
276 if (start_index < end_index)
278 if (string[start_index] == '-')
280 if (start_index + 3 <= end_index
281 && memcmp (string + start_index, "nan", 3) == 0)
284 if (start_index == end_index
285 || (string[start_index] == '(' && string[end_index - 1] == ')'))
291 static char buf[10000];
292 static long double zeroL = 0.0L;
297 if (sprintf (buf, "%Lf", 1.0L / 0.0L) < 0
298 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
300 if (sprintf (buf, "%Lf", -1.0L / 0.0L) < 0
301 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
303 if (sprintf (buf, "%Lf", zeroL / zeroL) < 0
304 || !strisnan (buf, 0, strlen (buf)))
306 if (sprintf (buf, "%Le", 1.0L / 0.0L) < 0
307 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
309 if (sprintf (buf, "%Le", -1.0L / 0.0L) < 0
310 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
312 if (sprintf (buf, "%Le", zeroL / zeroL) < 0
313 || !strisnan (buf, 0, strlen (buf)))
315 if (sprintf (buf, "%Lg", 1.0L / 0.0L) < 0
316 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
318 if (sprintf (buf, "%Lg", -1.0L / 0.0L) < 0
319 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
321 if (sprintf (buf, "%Lg", zeroL / zeroL) < 0
322 || !strisnan (buf, 0, strlen (buf)))
324 #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_))
325 /* Representation of an 80-bit 'long double' as an initializer for a sequence
326 of 'unsigned int' words. */
327 # ifdef WORDS_BIGENDIAN
328 # define LDBL80_WORDS(exponent,manthi,mantlo) \
329 { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
330 ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \
331 (unsigned int) (mantlo) << 16 \
334 # define LDBL80_WORDS(exponent,manthi,mantlo) \
335 { mantlo, manthi, exponent }
338 static union { unsigned int word[4]; long double value; } x =
339 { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
340 if (sprintf (buf, "%Lf", x.value) < 0
341 || !strisnan (buf, 0, strlen (buf)))
343 if (sprintf (buf, "%Le", x.value) < 0
344 || !strisnan (buf, 0, strlen (buf)))
346 if (sprintf (buf, "%Lg", x.value) < 0
347 || !strisnan (buf, 0, strlen (buf)))
351 /* Signalling NaN. */
352 static union { unsigned int word[4]; long double value; } x =
353 { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
354 if (sprintf (buf, "%Lf", x.value) < 0
355 || !strisnan (buf, 0, strlen (buf)))
357 if (sprintf (buf, "%Le", x.value) < 0
358 || !strisnan (buf, 0, strlen (buf)))
360 if (sprintf (buf, "%Lg", x.value) < 0
361 || !strisnan (buf, 0, strlen (buf)))
365 static union { unsigned int word[4]; long double value; } x =
366 { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
367 if (sprintf (buf, "%Lf", x.value) < 0
368 || !strisnan (buf, 0, strlen (buf)))
370 if (sprintf (buf, "%Le", x.value) < 0
371 || !strisnan (buf, 0, strlen (buf)))
373 if (sprintf (buf, "%Lg", x.value) < 0
374 || !strisnan (buf, 0, strlen (buf)))
377 { /* Pseudo-Infinity. */
378 static union { unsigned int word[4]; long double value; } x =
379 { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
380 if (sprintf (buf, "%Lf", x.value) < 0
381 || !strisnan (buf, 0, strlen (buf)))
383 if (sprintf (buf, "%Le", x.value) < 0
384 || !strisnan (buf, 0, strlen (buf)))
386 if (sprintf (buf, "%Lg", x.value) < 0
387 || !strisnan (buf, 0, strlen (buf)))
391 static union { unsigned int word[4]; long double value; } x =
392 { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
393 if (sprintf (buf, "%Lf", x.value) < 0
394 || !strisnan (buf, 0, strlen (buf)))
396 if (sprintf (buf, "%Le", x.value) < 0
397 || !strisnan (buf, 0, strlen (buf)))
399 if (sprintf (buf, "%Lg", x.value) < 0
400 || !strisnan (buf, 0, strlen (buf)))
403 { /* Unnormalized number. */
404 static union { unsigned int word[4]; long double value; } x =
405 { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
406 if (sprintf (buf, "%Lf", x.value) < 0
407 || !strisnan (buf, 0, strlen (buf)))
409 if (sprintf (buf, "%Le", x.value) < 0
410 || !strisnan (buf, 0, strlen (buf)))
412 if (sprintf (buf, "%Lg", x.value) < 0
413 || !strisnan (buf, 0, strlen (buf)))
416 { /* Pseudo-Denormal. */
417 static union { unsigned int word[4]; long double value; } x =
418 { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
419 if (sprintf (buf, "%Lf", x.value) < 0
420 || !strisnan (buf, 0, strlen (buf)))
422 if (sprintf (buf, "%Le", x.value) < 0
423 || !strisnan (buf, 0, strlen (buf)))
425 if (sprintf (buf, "%Lg", x.value) < 0
426 || !strisnan (buf, 0, strlen (buf)))
432 [gl_cv_func_printf_infinite_long_double=yes],
433 [gl_cv_func_printf_infinite_long_double=no],
437 # Guess no on ia64, x86_64, i386.
438 ia64 | x86_64 | i*86) gl_cv_func_printf_infinite_long_double="guessing no";;
441 # Guess yes on glibc systems.
442 *-gnu*) gl_cv_func_printf_infinite_long_double="guessing yes";;
443 # Guess yes on FreeBSD >= 6.
444 freebsd[1-5]*) gl_cv_func_printf_infinite_long_double="guessing no";;
445 freebsd* | kfreebsd*) gl_cv_func_printf_infinite_long_double="guessing yes";;
446 # Guess yes on HP-UX >= 11.
447 hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite_long_double="guessing no";;
448 hpux*) gl_cv_func_printf_infinite_long_double="guessing yes";;
449 # If we don't know, assume the worst.
450 *) gl_cv_func_printf_infinite_long_double="guessing no";;
459 gl_cv_func_printf_infinite_long_double="irrelevant"
464 dnl Test whether the *printf family of functions supports the 'a' and 'A'
465 dnl conversion specifier for hexadecimal output of floating-point numbers.
466 dnl (ISO C99, POSIX:2001)
467 dnl Result is gl_cv_func_printf_directive_a.
469 AC_DEFUN([gl_PRINTF_DIRECTIVE_A],
471 AC_REQUIRE([AC_PROG_CC])
472 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
473 AC_CACHE_CHECK([whether printf supports the 'a' and 'A' directives],
474 [gl_cv_func_printf_directive_a],
480 static char buf[100];
484 if (sprintf (buf, "%a %d", 3.1416015625, 33, 44, 55) < 0
485 || (strcmp (buf, "0x1.922p+1 33") != 0
486 && strcmp (buf, "0x3.244p+0 33") != 0
487 && strcmp (buf, "0x6.488p-1 33") != 0
488 && strcmp (buf, "0xc.91p-2 33") != 0))
490 if (sprintf (buf, "%A %d", -3.1416015625, 33, 44, 55) < 0
491 || (strcmp (buf, "-0X1.922P+1 33") != 0
492 && strcmp (buf, "-0X3.244P+0 33") != 0
493 && strcmp (buf, "-0X6.488P-1 33") != 0
494 && strcmp (buf, "-0XC.91P-2 33") != 0))
496 /* This catches a FreeBSD 6.1 bug: it doesn't round. */
497 if (sprintf (buf, "%.2a %d", 1.51, 33, 44, 55) < 0
498 || (strcmp (buf, "0x1.83p+0 33") != 0
499 && strcmp (buf, "0x3.05p-1 33") != 0
500 && strcmp (buf, "0x6.0ap-2 33") != 0
501 && strcmp (buf, "0xc.14p-3 33") != 0))
503 /* This catches a FreeBSD 6.1 bug. See
504 <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html> */
505 if (sprintf (buf, "%010a %d", 1.0 / 0.0, 33, 44, 55) < 0
508 /* This catches a MacOS X 10.3.9 (Darwin 7.9) bug. */
509 if (sprintf (buf, "%.1a", 1.999) < 0
510 || (strcmp (buf, "0x1.0p+1") != 0
511 && strcmp (buf, "0x2.0p+0") != 0
512 && strcmp (buf, "0x4.0p-1") != 0
513 && strcmp (buf, "0x8.0p-2") != 0))
515 /* This catches the same MacOS X 10.3.9 (Darwin 7.9) bug and also a
516 glibc 2.4 bug <http://sourceware.org/bugzilla/show_bug.cgi?id=2908>. */
517 if (sprintf (buf, "%.1La", 1.999L) < 0
518 || (strcmp (buf, "0x1.0p+1") != 0
519 && strcmp (buf, "0x2.0p+0") != 0
520 && strcmp (buf, "0x4.0p-1") != 0
521 && strcmp (buf, "0x8.0p-2") != 0))
525 [gl_cv_func_printf_directive_a=yes],
526 [gl_cv_func_printf_directive_a=no],
529 # Guess yes on glibc >= 2.5 systems.
531 AC_EGREP_CPP([BZ2908], [
532 #include <features.h>
533 #ifdef __GNU_LIBRARY__
534 #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 5) || (__GLIBC__ > 2)) && !defined __UCLIBC__
539 [gl_cv_func_printf_directive_a="guessing yes"],
540 [gl_cv_func_printf_directive_a="guessing no"])
542 # If we don't know, assume the worst.
543 *) gl_cv_func_printf_directive_a="guessing no";;
549 dnl Test whether the *printf family of functions supports the %F format
550 dnl directive. (ISO C99, POSIX:2001)
551 dnl Result is gl_cv_func_printf_directive_f.
553 AC_DEFUN([gl_PRINTF_DIRECTIVE_F],
555 AC_REQUIRE([AC_PROG_CC])
556 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
557 AC_CACHE_CHECK([whether printf supports the 'F' directive],
558 [gl_cv_func_printf_directive_f],
564 static char buf[100];
568 if (sprintf (buf, "%F %d", 1234567.0, 33, 44, 55) < 0
569 || strcmp (buf, "1234567.000000 33") != 0)
571 if (sprintf (buf, "%F", 1.0 / 0.0) < 0
572 || (strcmp (buf, "INF") != 0 && strcmp (buf, "INFINITY") != 0))
574 /* This catches a Cygwin 1.5.x bug. */
575 if (sprintf (buf, "%.F", 1234.0) < 0
576 || strcmp (buf, "1234") != 0)
580 [gl_cv_func_printf_directive_f=yes],
581 [gl_cv_func_printf_directive_f=no],
585 # Guess yes on glibc systems.
586 *-gnu*) gl_cv_func_printf_directive_f="guessing yes";;
587 # Guess yes on FreeBSD >= 6.
588 freebsd[1-5]*) gl_cv_func_printf_directive_f="guessing no";;
589 freebsd* | kfreebsd*) gl_cv_func_printf_directive_f="guessing yes";;
590 # Guess yes on MacOS X >= 10.3.
591 darwin[1-6].*) gl_cv_func_printf_directive_f="guessing no";;
592 darwin*) gl_cv_func_printf_directive_f="guessing yes";;
593 # Guess yes on Solaris >= 2.10.
594 solaris2.[1-9][0-9]*) gl_cv_func_printf_sizes_c99="guessing yes";;
595 solaris*) gl_cv_func_printf_sizes_c99="guessing no";;
596 # If we don't know, assume the worst.
597 *) gl_cv_func_printf_directive_f="guessing no";;
604 dnl Test whether the *printf family of functions supports the %n format
605 dnl directive. (ISO C99, POSIX:2001)
606 dnl Result is gl_cv_func_printf_directive_n.
608 AC_DEFUN([gl_PRINTF_DIRECTIVE_N],
610 AC_REQUIRE([AC_PROG_CC])
611 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
612 AC_CACHE_CHECK([whether printf supports the 'n' directive],
613 [gl_cv_func_printf_directive_n],
619 static char fmtstring[10];
620 static char buf[100];
624 /* Copy the format string. Some systems (glibc with _FORTIFY_SOURCE=2)
625 support %n in format strings in read-only memory but not in writable
627 strcpy (fmtstring, "%d %n");
628 if (sprintf (buf, fmtstring, 123, &count, 33, 44, 55) < 0
629 || strcmp (buf, "123 ") != 0
634 [gl_cv_func_printf_directive_n=yes],
635 [gl_cv_func_printf_directive_n=no],
639 *) gl_cv_func_printf_directive_n="guessing yes";;
646 dnl Test whether the *printf family of functions supports the %ls format
647 dnl directive and in particular, when a precision is specified, whether
648 dnl the functions stop converting the wide string argument when the number
649 dnl of bytes that have been produced by this conversion equals or exceeds
651 dnl Result is gl_cv_func_printf_directive_ls.
653 AC_DEFUN([gl_PRINTF_DIRECTIVE_LS],
655 AC_REQUIRE([AC_PROG_CC])
656 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
657 AC_CACHE_CHECK([whether printf supports the 'ls' directive],
658 [gl_cv_func_printf_directive_ls],
662 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
664 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
665 included before <wchar.h>. */
675 /* Test whether %ls works at all.
676 This test fails on OpenBSD 4.0, IRIX 6.5, Solaris 2.6, Haiku, but not on
679 static const wchar_t wstring[] = { 'a', 'b', 'c', 0 };
681 if (sprintf (buf, "%ls", wstring) < 0
682 || strcmp (buf, "abc") != 0)
685 /* This test fails on IRIX 6.5, Solaris 2.6, Cygwin 1.5, Haiku (with an
686 assertion failure inside libc), but not on OpenBSD 4.0. */
688 static const wchar_t wstring[] = { 'a', 0 };
690 if (sprintf (buf, "%ls", wstring) < 0
691 || strcmp (buf, "a") != 0)
694 /* Test whether precisions in %ls are supported as specified in ISO C 99
696 "If a precision is specified, no more than that many bytes are written
697 (including shift sequences, if any), and the array shall contain a
698 null wide character if, to equal the multibyte character sequence
699 length given by the precision, the function would need to access a
700 wide character one past the end of the array."
701 This test fails on Solaris 10. */
703 static const wchar_t wstring[] = { 'a', 'b', (wchar_t) 0xfdfdfdfd, 0 };
705 if (sprintf (buf, "%.2ls", wstring) < 0
706 || strcmp (buf, "ab") != 0)
711 [gl_cv_func_printf_directive_ls=yes],
712 [gl_cv_func_printf_directive_ls=no],
716 openbsd*) gl_cv_func_printf_directive_ls="guessing no";;
717 irix*) gl_cv_func_printf_directive_ls="guessing no";;
718 solaris*) gl_cv_func_printf_directive_ls="guessing no";;
719 cygwin*) gl_cv_func_printf_directive_ls="guessing no";;
720 beos* | haiku*) gl_cv_func_printf_directive_ls="guessing no";;
721 *) gl_cv_func_printf_directive_ls="guessing yes";;
728 dnl Test whether the *printf family of functions supports POSIX/XSI format
729 dnl strings with positions. (POSIX:2001)
730 dnl Result is gl_cv_func_printf_positions.
732 AC_DEFUN([gl_PRINTF_POSITIONS],
734 AC_REQUIRE([AC_PROG_CC])
735 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
736 AC_CACHE_CHECK([whether printf supports POSIX/XSI format strings with positions],
737 [gl_cv_func_printf_positions],
743 /* The string "%2$d %1$d", with dollar characters protected from the shell's
744 dollar expansion (possibly an autoconf bug). */
745 static char format[] = { '%', '2', '$', 'd', ' ', '%', '1', '$', 'd', '\0' };
746 static char buf[100];
749 sprintf (buf, format, 33, 55);
750 return (strcmp (buf, "55 33") != 0);
752 [gl_cv_func_printf_positions=yes],
753 [gl_cv_func_printf_positions=no],
757 netbsd[1-3]* | netbsdelf[1-3]* | netbsdaout[1-3]* | netbsdcoff[1-3]*)
758 gl_cv_func_printf_positions="guessing no";;
759 beos*) gl_cv_func_printf_positions="guessing no";;
760 mingw* | pw*) gl_cv_func_printf_positions="guessing no";;
761 *) gl_cv_func_printf_positions="guessing yes";;
768 dnl Test whether the *printf family of functions supports POSIX/XSI format
769 dnl strings with the ' flag for grouping of decimal digits. (POSIX:2001)
770 dnl Result is gl_cv_func_printf_flag_grouping.
772 AC_DEFUN([gl_PRINTF_FLAG_GROUPING],
774 AC_REQUIRE([AC_PROG_CC])
775 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
776 AC_CACHE_CHECK([whether printf supports the grouping flag],
777 [gl_cv_func_printf_flag_grouping],
783 static char buf[100];
786 if (sprintf (buf, "%'d %d", 1234567, 99) < 0
787 || buf[strlen (buf) - 1] != '9')
791 [gl_cv_func_printf_flag_grouping=yes],
792 [gl_cv_func_printf_flag_grouping=no],
796 cygwin*) gl_cv_func_printf_flag_grouping="guessing no";;
797 netbsd*) gl_cv_func_printf_flag_grouping="guessing no";;
798 mingw* | pw*) gl_cv_func_printf_flag_grouping="guessing no";;
799 *) gl_cv_func_printf_flag_grouping="guessing yes";;
806 dnl Test whether the *printf family of functions supports the - flag correctly.
808 dnl <http://lists.gnu.org/archive/html/bug-coreutils/2008-02/msg00035.html>
809 dnl Result is gl_cv_func_printf_flag_leftadjust.
811 AC_DEFUN([gl_PRINTF_FLAG_LEFTADJUST],
813 AC_REQUIRE([AC_PROG_CC])
814 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
815 AC_CACHE_CHECK([whether printf supports the left-adjust flag correctly],
816 [gl_cv_func_printf_flag_leftadjust],
822 static char buf[100];
825 /* Check that a '-' flag is not annihilated by a negative width. */
826 if (sprintf (buf, "a%-*sc", -3, "b") < 0
827 || strcmp (buf, "ab c") != 0)
831 [gl_cv_func_printf_flag_leftadjust=yes],
832 [gl_cv_func_printf_flag_leftadjust=no],
836 # Guess yes on HP-UX 11.
837 hpux11*) gl_cv_func_printf_flag_leftadjust="guessing yes";;
838 # Guess no on HP-UX 10 and older.
839 hpux*) gl_cv_func_printf_flag_leftadjust="guessing no";;
840 # Guess yes otherwise.
841 *) gl_cv_func_printf_flag_leftadjust="guessing yes";;
848 dnl Test whether the *printf family of functions supports padding of non-finite
849 dnl values with the 0 flag correctly. (ISO C99 + TC1 + TC2.) See
850 dnl <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html>
851 dnl Result is gl_cv_func_printf_flag_zero.
853 AC_DEFUN([gl_PRINTF_FLAG_ZERO],
855 AC_REQUIRE([AC_PROG_CC])
856 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
857 AC_CACHE_CHECK([whether printf supports the zero flag correctly],
858 [gl_cv_func_printf_flag_zero],
864 static char buf[100];
867 if (sprintf (buf, "%010f", 1.0 / 0.0, 33, 44, 55) < 0
868 || (strcmp (buf, " inf") != 0
869 && strcmp (buf, " infinity") != 0))
873 [gl_cv_func_printf_flag_zero=yes],
874 [gl_cv_func_printf_flag_zero=no],
878 # Guess yes on glibc systems.
879 *-gnu*) gl_cv_func_printf_flag_zero="guessing yes";;
881 beos*) gl_cv_func_printf_flag_zero="guessing yes";;
882 # If we don't know, assume the worst.
883 *) gl_cv_func_printf_flag_zero="guessing no";;
890 dnl Test whether the *printf family of functions supports large precisions.
891 dnl On mingw, precisions larger than 512 are treated like 512, in integer,
892 dnl floating-point or pointer output. On Solaris 10/x86, precisions larger
893 dnl than 510 in floating-point output crash the program. On Solaris 10/SPARC,
894 dnl precisions larger than 510 in floating-point output yield wrong results.
895 dnl On BeOS, precisions larger than 1044 crash the program.
896 dnl Result is gl_cv_func_printf_precision.
898 AC_DEFUN([gl_PRINTF_PRECISION],
900 AC_REQUIRE([AC_PROG_CC])
901 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
902 AC_CACHE_CHECK([whether printf supports large precisions],
903 [gl_cv_func_printf_precision],
909 static char buf[5000];
914 /* On BeOS, this would crash and show a dialog box. Avoid the crash. */
917 if (sprintf (buf, "%.4000d %d", 1, 33, 44) < 4000 + 3)
919 if (sprintf (buf, "%.4000f %d", 1.0, 33, 44) < 4000 + 5)
921 if (sprintf (buf, "%.511f %d", 1.0, 33, 44) < 511 + 5
926 [gl_cv_func_printf_precision=yes],
927 [gl_cv_func_printf_precision=no],
931 # Guess no only on Solaris, native Win32, and BeOS systems.
932 solaris*) gl_cv_func_printf_precision="guessing no" ;;
933 mingw* | pw*) gl_cv_func_printf_precision="guessing no" ;;
934 beos*) gl_cv_func_printf_precision="guessing no" ;;
935 *) gl_cv_func_printf_precision="guessing yes" ;;
942 dnl Test whether the *printf family of functions recovers gracefully in case
943 dnl of an out-of-memory condition, or whether it crashes the entire program.
944 dnl Result is gl_cv_func_printf_enomem.
946 AC_DEFUN([gl_PRINTF_ENOMEM],
948 AC_REQUIRE([AC_PROG_CC])
949 AC_REQUIRE([gl_MULTIARCH])
950 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
951 AC_CACHE_CHECK([whether printf survives out-of-memory conditions],
952 [gl_cv_func_printf_enomem],
954 gl_cv_func_printf_enomem="guessing no"
955 if test "$cross_compiling" = no; then
956 if test $APPLE_UNIVERSAL_BUILD = 0; then
957 AC_LANG_CONFTEST([AC_LANG_SOURCE([
961 #include <sys/types.h>
962 #include <sys/time.h>
963 #include <sys/resource.h>
970 /* Some printf implementations allocate temporary space with malloc. */
971 /* On BSD systems, malloc() is limited by RLIMIT_DATA. */
973 if (getrlimit (RLIMIT_DATA, &limit) < 0)
975 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
976 limit.rlim_max = 5000000;
977 limit.rlim_cur = limit.rlim_max;
978 if (setrlimit (RLIMIT_DATA, &limit) < 0)
981 /* On Linux systems, malloc() is limited by RLIMIT_AS. */
983 if (getrlimit (RLIMIT_AS, &limit) < 0)
985 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
986 limit.rlim_max = 5000000;
987 limit.rlim_cur = limit.rlim_max;
988 if (setrlimit (RLIMIT_AS, &limit) < 0)
991 /* Some printf implementations allocate temporary space on the stack. */
993 if (getrlimit (RLIMIT_STACK, &limit) < 0)
995 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
996 limit.rlim_max = 5000000;
997 limit.rlim_cur = limit.rlim_max;
998 if (setrlimit (RLIMIT_STACK, &limit) < 0)
1001 ret = printf ("%.5000000f", 1.0);
1002 return !(ret == 5000002 || (ret < 0 && errno == ENOMEM));
1006 if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
1009 if test $result != 0 && test $result != 77; then result=1; fi
1011 ) >/dev/null 2>/dev/null
1013 0) gl_cv_func_printf_enomem="yes" ;;
1014 77) gl_cv_func_printf_enomem="guessing no" ;;
1015 *) gl_cv_func_printf_enomem="no" ;;
1018 gl_cv_func_printf_enomem="guessing no"
1022 dnl A universal build on Apple MacOS X platforms.
1023 dnl The result would be 'no' in 32-bit mode and 'yes' in 64-bit mode.
1024 dnl But we need a configuration result that is valid in both modes.
1025 gl_cv_func_printf_enomem="guessing no"
1028 if test "$gl_cv_func_printf_enomem" = "guessing no"; then
1031 # Guess yes on glibc systems.
1032 *-gnu*) gl_cv_func_printf_enomem="guessing yes";;
1033 # Guess yes on Solaris.
1034 solaris*) gl_cv_func_printf_enomem="guessing yes";;
1036 aix*) gl_cv_func_printf_enomem="guessing yes";;
1037 # Guess yes on HP-UX/hppa.
1038 hpux*) case "$host_cpu" in
1039 hppa*) gl_cv_func_printf_enomem="guessing yes";;
1040 *) gl_cv_func_printf_enomem="guessing no";;
1043 # Guess yes on IRIX.
1044 irix*) gl_cv_func_printf_enomem="guessing yes";;
1045 # Guess yes on OSF/1.
1046 osf*) gl_cv_func_printf_enomem="guessing yes";;
1047 # Guess yes on BeOS.
1048 beos*) gl_cv_func_printf_enomem="guessing yes";;
1049 # Guess yes on Haiku.
1050 haiku*) gl_cv_func_printf_enomem="guessing yes";;
1051 # If we don't know, assume the worst.
1052 *) gl_cv_func_printf_enomem="guessing no";;
1059 dnl Test whether the snprintf function exists. (ISO C99, POSIX:2001)
1060 dnl Result is ac_cv_func_snprintf.
1062 AC_DEFUN([gl_SNPRINTF_PRESENCE],
1064 AC_CHECK_FUNCS_ONCE([snprintf])
1067 dnl Test whether the string produced by the snprintf function is always NUL
1068 dnl terminated. (ISO C99, POSIX:2001)
1069 dnl Result is gl_cv_func_snprintf_truncation_c99.
1071 AC_DEFUN([gl_SNPRINTF_TRUNCATION_C99],
1073 AC_REQUIRE([AC_PROG_CC])
1074 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1075 AC_CACHE_CHECK([whether snprintf truncates the result as in C99],
1076 [gl_cv_func_snprintf_truncation_c99],
1082 static char buf[100];
1085 strcpy (buf, "ABCDEF");
1086 snprintf (buf, 3, "%d %d", 4567, 89);
1087 if (memcmp (buf, "45\0DEF", 6) != 0)
1091 [gl_cv_func_snprintf_truncation_c99=yes],
1092 [gl_cv_func_snprintf_truncation_c99=no],
1096 # Guess yes on glibc systems.
1097 *-gnu*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1098 # Guess yes on FreeBSD >= 5.
1099 freebsd[1-4]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
1100 freebsd* | kfreebsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1101 # Guess yes on MacOS X >= 10.3.
1102 darwin[1-6].*) gl_cv_func_snprintf_truncation_c99="guessing no";;
1103 darwin*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1104 # Guess yes on OpenBSD >= 3.9.
1105 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
1106 gl_cv_func_snprintf_truncation_c99="guessing no";;
1107 openbsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1108 # Guess yes on Solaris >= 2.6.
1109 solaris2.[0-5] | solaris2.[0-5].*)
1110 gl_cv_func_snprintf_truncation_c99="guessing no";;
1111 solaris*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1112 # Guess yes on AIX >= 4.
1113 aix[1-3]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
1114 aix*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1115 # Guess yes on HP-UX >= 11.
1116 hpux[7-9]* | hpux10*) gl_cv_func_snprintf_truncation_c99="guessing no";;
1117 hpux*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1118 # Guess yes on IRIX >= 6.5.
1119 irix6.5) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1120 # Guess yes on OSF/1 >= 5.
1121 osf[3-4]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
1122 osf*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1123 # Guess yes on NetBSD >= 3.
1124 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1125 gl_cv_func_snprintf_truncation_c99="guessing no";;
1126 netbsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1127 # Guess yes on BeOS.
1128 beos*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
1129 # If we don't know, assume the worst.
1130 *) gl_cv_func_snprintf_truncation_c99="guessing no";;
1137 dnl Test whether the return value of the snprintf function is the number
1138 dnl of bytes (excluding the terminating NUL) that would have been produced
1139 dnl if the buffer had been large enough. (ISO C99, POSIX:2001)
1140 dnl For example, this test program fails on IRIX 6.5:
1141 dnl ---------------------------------------------------------------------
1142 dnl #include <stdio.h>
1145 dnl static char buf[8];
1146 dnl int retval = snprintf (buf, 3, "%d", 12345);
1147 dnl return retval >= 0 && retval < 3;
1149 dnl ---------------------------------------------------------------------
1150 dnl Result is gl_cv_func_snprintf_retval_c99.
1152 AC_DEFUN_ONCE([gl_SNPRINTF_RETVAL_C99],
1154 AC_REQUIRE([AC_PROG_CC])
1155 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1156 AC_CACHE_CHECK([whether snprintf returns a byte count as in C99],
1157 [gl_cv_func_snprintf_retval_c99],
1163 static char buf[100];
1166 strcpy (buf, "ABCDEF");
1167 if (snprintf (buf, 3, "%d %d", 4567, 89) != 7)
1169 if (snprintf (buf, 0, "%d %d", 4567, 89) != 7)
1171 if (snprintf (NULL, 0, "%d %d", 4567, 89) != 7)
1175 [gl_cv_func_snprintf_retval_c99=yes],
1176 [gl_cv_func_snprintf_retval_c99=no],
1180 # Guess yes on glibc systems.
1181 *-gnu*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1182 # Guess yes on FreeBSD >= 5.
1183 freebsd[1-4]*) gl_cv_func_snprintf_retval_c99="guessing no";;
1184 freebsd* | kfreebsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1185 # Guess yes on MacOS X >= 10.3.
1186 darwin[1-6].*) gl_cv_func_snprintf_retval_c99="guessing no";;
1187 darwin*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1188 # Guess yes on OpenBSD >= 3.9.
1189 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
1190 gl_cv_func_snprintf_retval_c99="guessing no";;
1191 openbsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1192 # Guess yes on Solaris >= 2.10.
1193 solaris2.[1-9][0-9]*) gl_cv_func_printf_sizes_c99="guessing yes";;
1194 solaris*) gl_cv_func_printf_sizes_c99="guessing no";;
1195 # Guess yes on AIX >= 4.
1196 aix[1-3]*) gl_cv_func_snprintf_retval_c99="guessing no";;
1197 aix*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1198 # Guess yes on NetBSD >= 3.
1199 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1200 gl_cv_func_snprintf_retval_c99="guessing no";;
1201 netbsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1202 # Guess yes on BeOS.
1203 beos*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1204 # If we don't know, assume the worst.
1205 *) gl_cv_func_snprintf_retval_c99="guessing no";;
1212 dnl Test whether the snprintf function supports the %n format directive
1213 dnl also in truncated portions of the format string. (ISO C99, POSIX:2001)
1214 dnl Result is gl_cv_func_snprintf_directive_n.
1216 AC_DEFUN([gl_SNPRINTF_DIRECTIVE_N],
1218 AC_REQUIRE([AC_PROG_CC])
1219 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1220 AC_CACHE_CHECK([whether snprintf fully supports the 'n' directive],
1221 [gl_cv_func_snprintf_directive_n],
1227 static char fmtstring[10];
1228 static char buf[100];
1232 /* Copy the format string. Some systems (glibc with _FORTIFY_SOURCE=2)
1233 support %n in format strings in read-only memory but not in writable
1235 strcpy (fmtstring, "%d %n");
1236 snprintf (buf, 4, fmtstring, 12345, &count, 33, 44, 55);
1241 [gl_cv_func_snprintf_directive_n=yes],
1242 [gl_cv_func_snprintf_directive_n=no],
1246 # Guess yes on glibc systems.
1247 *-gnu*) gl_cv_func_snprintf_directive_n="guessing yes";;
1248 # Guess yes on FreeBSD >= 5.
1249 freebsd[1-4]*) gl_cv_func_snprintf_directive_n="guessing no";;
1250 freebsd* | kfreebsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
1251 # Guess yes on MacOS X >= 10.3.
1252 darwin[1-6].*) gl_cv_func_snprintf_directive_n="guessing no";;
1253 darwin*) gl_cv_func_snprintf_directive_n="guessing yes";;
1254 # Guess yes on Solaris >= 2.6.
1255 solaris2.[0-5] | solaris2.[0-5].*)
1256 gl_cv_func_snprintf_directive_n="guessing no";;
1257 solaris*) gl_cv_func_snprintf_directive_n="guessing yes";;
1258 # Guess yes on AIX >= 4.
1259 aix[1-3]*) gl_cv_func_snprintf_directive_n="guessing no";;
1260 aix*) gl_cv_func_snprintf_directive_n="guessing yes";;
1261 # Guess yes on IRIX >= 6.5.
1262 irix6.5) gl_cv_func_snprintf_directive_n="guessing yes";;
1263 # Guess yes on OSF/1 >= 5.
1264 osf[3-4]*) gl_cv_func_snprintf_directive_n="guessing no";;
1265 osf*) gl_cv_func_snprintf_directive_n="guessing yes";;
1266 # Guess yes on NetBSD >= 3.
1267 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1268 gl_cv_func_snprintf_directive_n="guessing no";;
1269 netbsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
1270 # Guess yes on BeOS.
1271 beos*) gl_cv_func_snprintf_directive_n="guessing yes";;
1272 # If we don't know, assume the worst.
1273 *) gl_cv_func_snprintf_directive_n="guessing no";;
1280 dnl Test whether the snprintf function, when passed a size = 1, writes any
1281 dnl output without bounds in this case, behaving like sprintf. This is the
1282 dnl case on Linux libc5.
1283 dnl Result is gl_cv_func_snprintf_size1.
1285 AC_DEFUN([gl_SNPRINTF_SIZE1],
1287 AC_REQUIRE([AC_PROG_CC])
1288 AC_CACHE_CHECK([whether snprintf respects a size of 1],
1289 [gl_cv_func_snprintf_size1],
1296 static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' };
1297 snprintf (buf, 1, "%d", 12345);
1298 return buf[1] != 'E';
1300 [gl_cv_func_snprintf_size1=yes],
1301 [gl_cv_func_snprintf_size1=no],
1302 [gl_cv_func_snprintf_size1="guessing yes"])
1306 dnl Test whether the vsnprintf function, when passed a zero size, produces no
1307 dnl output. (ISO C99, POSIX:2001)
1308 dnl For example, snprintf nevertheless writes a NUL byte in this case
1310 dnl ---------------------------------------------------------------------
1311 dnl #include <stdio.h>
1314 dnl static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' };
1315 dnl snprintf (buf, 0, "%d", 12345);
1316 dnl return buf[0] != 'D';
1318 dnl ---------------------------------------------------------------------
1319 dnl And vsnprintf writes any output without bounds in this case, behaving like
1320 dnl vsprintf, on HP-UX 11 and OSF/1 5.1:
1321 dnl ---------------------------------------------------------------------
1322 dnl #include <stdarg.h>
1323 dnl #include <stdio.h>
1324 dnl static int my_snprintf (char *buf, int size, const char *format, ...)
1328 dnl va_start (args, format);
1329 dnl ret = vsnprintf (buf, size, format, args);
1335 dnl static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' };
1336 dnl my_snprintf (buf, 0, "%d", 12345);
1337 dnl return buf[0] != 'D';
1339 dnl ---------------------------------------------------------------------
1340 dnl Result is gl_cv_func_vsnprintf_zerosize_c99.
1342 AC_DEFUN([gl_VSNPRINTF_ZEROSIZE_C99],
1344 AC_REQUIRE([AC_PROG_CC])
1345 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1346 AC_CACHE_CHECK([whether vsnprintf respects a zero size as in C99],
1347 [gl_cv_func_vsnprintf_zerosize_c99],
1353 static int my_snprintf (char *buf, int size, const char *format, ...)
1357 va_start (args, format);
1358 ret = vsnprintf (buf, size, format, args);
1364 static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' };
1365 my_snprintf (buf, 0, "%d", 12345);
1366 return buf[0] != 'D';
1368 [gl_cv_func_vsnprintf_zerosize_c99=yes],
1369 [gl_cv_func_vsnprintf_zerosize_c99=no],
1373 # Guess yes on glibc systems.
1374 *-gnu*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1375 # Guess yes on FreeBSD >= 5.
1376 freebsd[1-4]*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1377 freebsd* | kfreebsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1378 # Guess yes on MacOS X >= 10.3.
1379 darwin[1-6].*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1380 darwin*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1381 # Guess yes on Cygwin.
1382 cygwin*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1383 # Guess yes on Solaris >= 2.6.
1384 solaris2.[0-5] | solaris2.[0-5].*)
1385 gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1386 solaris*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1387 # Guess yes on AIX >= 4.
1388 aix[1-3]*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1389 aix*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1390 # Guess yes on IRIX >= 6.5.
1391 irix6.5) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1392 # Guess yes on NetBSD >= 3.
1393 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1394 gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1395 netbsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1396 # Guess yes on BeOS.
1397 beos*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1398 # Guess yes on mingw.
1399 mingw* | pw*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1400 # If we don't know, assume the worst.
1401 *) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1408 dnl The results of these tests on various platforms are:
1410 dnl 1 = gl_PRINTF_SIZES_C99
1411 dnl 2 = gl_PRINTF_LONG_DOUBLE
1412 dnl 3 = gl_PRINTF_INFINITE
1413 dnl 4 = gl_PRINTF_INFINITE_LONG_DOUBLE
1414 dnl 5 = gl_PRINTF_DIRECTIVE_A
1415 dnl 6 = gl_PRINTF_DIRECTIVE_F
1416 dnl 7 = gl_PRINTF_DIRECTIVE_N
1417 dnl 8 = gl_PRINTF_DIRECTIVE_LS
1418 dnl 9 = gl_PRINTF_POSITIONS
1419 dnl 10 = gl_PRINTF_FLAG_GROUPING
1420 dnl 11 = gl_PRINTF_FLAG_LEFTADJUST
1421 dnl 12 = gl_PRINTF_FLAG_ZERO
1422 dnl 13 = gl_PRINTF_PRECISION
1423 dnl 14 = gl_PRINTF_ENOMEM
1424 dnl 15 = gl_SNPRINTF_PRESENCE
1425 dnl 16 = gl_SNPRINTF_TRUNCATION_C99
1426 dnl 17 = gl_SNPRINTF_RETVAL_C99
1427 dnl 18 = gl_SNPRINTF_DIRECTIVE_N
1428 dnl 19 = gl_SNPRINTF_SIZE1
1429 dnl 20 = gl_VSNPRINTF_ZEROSIZE_C99
1431 dnl 1 = checking whether printf supports size specifiers as in C99...
1432 dnl 2 = checking whether printf supports 'long double' arguments...
1433 dnl 3 = checking whether printf supports infinite 'double' arguments...
1434 dnl 4 = checking whether printf supports infinite 'long double' arguments...
1435 dnl 5 = checking whether printf supports the 'a' and 'A' directives...
1436 dnl 6 = checking whether printf supports the 'F' directive...
1437 dnl 7 = checking whether printf supports the 'n' directive...
1438 dnl 8 = checking whether printf supports the 'ls' directive...
1439 dnl 9 = checking whether printf supports POSIX/XSI format strings with positions...
1440 dnl 10 = checking whether printf supports the grouping flag...
1441 dnl 11 = checking whether printf supports the left-adjust flag correctly...
1442 dnl 12 = checking whether printf supports the zero flag correctly...
1443 dnl 13 = checking whether printf supports large precisions...
1444 dnl 14 = checking whether printf survives out-of-memory conditions...
1445 dnl 15 = checking for snprintf...
1446 dnl 16 = checking whether snprintf truncates the result as in C99...
1447 dnl 17 = checking whether snprintf returns a byte count as in C99...
1448 dnl 18 = checking whether snprintf fully supports the 'n' directive...
1449 dnl 19 = checking whether snprintf respects a size of 1...
1450 dnl 20 = checking whether vsnprintf respects a zero size as in C99...
1452 dnl . = yes, # = no.
1454 dnl 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
1455 dnl glibc 2.5 . . . . . . . . . . . . . . . . . . . .
1456 dnl glibc 2.3.6 . . . . # . . . . . . . . . . . . . . .
1457 dnl FreeBSD 5.4, 6.1 . . . . # . . . . . . # . # . . . . . .
1458 dnl MacOS X 10.5.8 . . . # # . . . . . . # . . . . . . . .
1459 dnl MacOS X 10.3.9 . . . . # . . . . . . # . # . . . . . .
1460 dnl OpenBSD 3.9, 4.0 . . # # # # . # . # . # . # . . . . . .
1461 dnl Cygwin 1.7.0 (2009) . . . # . . . ? . . . . . ? . . . . . .
1462 dnl Cygwin 1.5.25 (2008) . . . # # . . # . . . . . # . . . . . .
1463 dnl Cygwin 1.5.19 (2006) # . . # # # . # . # . # # # . . . . . .
1464 dnl Solaris 11 2010-11 . . # # # . . # . . . # . . . . . . . .
1465 dnl Solaris 10 . . # # # . . # . . . # # . . . . . . .
1466 dnl Solaris 2.6 ... 9 # . # # # # . # . . . # # . . . # . . .
1467 dnl Solaris 2.5.1 # . # # # # . # . . . # . . # # # # # #
1468 dnl AIX 5.2, 7.1 . . # # # . . . . . . # . . . . . . . .
1469 dnl AIX 4.3.2, 5.1 # . # # # # . . . . . # . . . . # . . .
1470 dnl HP-UX 11.31 . . . . # . . . . . . # . . . . # # . .
1471 dnl HP-UX 11.{00,11,23} # . . . # # . . . . . # . . . . # # . #
1472 dnl HP-UX 10.20 # . # . # # . ? . . # # . . . . # # ? #
1473 dnl IRIX 6.5 # . # # # # . # . . . # . . . . # . . .
1474 dnl OSF/1 5.1 # . # # # # . . . . . # . . . . # . . #
1475 dnl OSF/1 4.0d # . # # # # . . . . . # . . # # # # # #
1476 dnl NetBSD 5.0 . . . # # . . . . . . # . # . . . . . .
1477 dnl NetBSD 4.0 . ? ? ? ? ? . ? . ? ? ? ? ? . . . ? ? ?
1478 dnl NetBSD 3.0 . . . . # # . ? # # ? # . # . . . . . .
1479 dnl Haiku . . . # # # . # . . . . . ? . . ? . . .
1480 dnl BeOS # # . # # # . ? # . ? . # ? . . ? . . .
1481 dnl mingw # # # # # # . . # # . # # ? . # # # . .