121 lines
4.4 KiB
Plaintext
121 lines
4.4 KiB
Plaintext
# FUNC_SNPRINTF_EXISTS
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# --------------------
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# Checks if snprintf exists. x_cv_func_snprintf_exists is set.
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AC_DEFUN([FUNC_SNPRINTF_EXISTS],
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[AC_CHECK_FUNC(snprintf, [x_cv_func_snprintf_exists=yes], [x_cv_func_snprintf_exists=no])])# FUNC_SNPRINTF_EXISTS
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# FUNC_SNPRINTF_SIZE
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# ------------------
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# Checks if snprintf honors its size argument. SNPRINTF_IS_SPRINTF is defined
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# if not. x_cv_func_snprintf_size is set to yes or no.
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#
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# Note that this depends on FUNC_SNPRINTF_EXISTS, so if that fails this will
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# also fail (and define SNPRINTF_IS_SPRINTF).
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AC_DEFUN([FUNC_SNPRINTF_SIZE],
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[AC_REQUIRE([FUNC_SNPRINTF_EXISTS])
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if test $x_cv_func_snprintf_exists != yes; then x_cv_func_snprintf_size=no; else
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AC_CACHE_CHECK([if snprintf honors the size argument], x_cv_func_snprintf_size,
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM(
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[[#if STDC_HEADERS || HAVE_STDIO_H
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# include <stdio.h>
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#else
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int snprintf(char *str, size_t size, const char *format, ...);
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#endif
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]],
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[[char foo[]="ABC"; snprintf(foo, 2, "%d", 12);
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exit((foo[0]=='1' && foo[1]=='\0' && foo[2]=='C')?0:1);]])],
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[x_cv_func_snprintf_size=yes],
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[x_cv_func_snprintf_size=no],
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[x_cv_func_snprintf_size=no])])
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fi
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test $x_cv_func_snprintf_size != yes && AC_DEFINE(SNPRINTF_IS_SPRINTF, 1, [Define if snprintf ignores the size argument])
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])# FUNC_SNPRINTF_SIZE
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# FUNC_SNPRINTF_RETVAL
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# ------------------
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# Checks if snprintf returns the number of bytes that would have been written,
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# as specified by C99. SNPRINTF_BOGUS_RETVAL is defined if not.
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# x_cv_func_snprintf_retval is set to yes or no.
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#
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# Note that this depends on FUNC_SNPRINTF_SIZE, so if that fails this will fail
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# too and SNPRINTF_BOGUS_RETVAL will be set.
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AC_DEFUN([FUNC_SNPRINTF_RETVAL],
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[AC_REQUIRE([FUNC_SNPRINTF_SIZE])
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if test $x_cv_func_snprintf_size != yes; then x_cv_func_snprintf_retval=no; else
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AC_CACHE_CHECK([if snprintf return value is sane], x_cv_func_snprintf_retval,
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM(
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[[#if STDC_HEADERS || HAVE_STDIO_H
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# include <stdio.h>
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#else
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int snprintf(char *str, size_t size, const char *format, ...);
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#endif
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]],
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[[char foo[10]; exit((snprintf(foo, 1, "%d", 9876)==4)?0:1);]])],
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[x_cv_func_snprintf_retval=yes],
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[x_cv_func_snprintf_retval=no],
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[x_cv_func_snprintf_retval=no])])
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fi
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test $x_cv_func_snprintf_retval != yes && AC_DEFINE(SNPRINTF_BOGUS_RETVAL, 1, [Define if snprintf's return value isn't as specified by C99])
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])# FUNC_SNPRINTF_RETVAL
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# FUNC_SNPRINTF_NULL_OK
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# ---------------------
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# Checks whether snprintf acceps a NULL string if size is zero. Sets
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# x_cv_func_snprintf_null_ok. If so, define SNPRINTF_NULL_OK.
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#
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# Note that this depends on FUNC_SNPRINTF_SIZE, so if that fails this will fail
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# too and SNPRINTF_BOGUS_RETVAL will be set.
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AC_DEFUN([FUNC_SNPRINTF_NULL_OK],
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[AC_REQUIRE([FUNC_SNPRINTF_SIZE])
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if test $x_cv_func_snprintf_size != yes; then x_cv_func_snprintf_null_ok=no; else
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AC_CACHE_CHECK([if snprintf(NULL, 0, ...) works], x_cv_func_snprintf_null_ok,
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM(
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[[#if STDC_HEADERS || HAVE_STDIO_H
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# include <stdio.h>
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#else
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int snprintf(char *str, size_t size, const char *format, ...);
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#endif
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]],
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[int r=snprintf(NULL, 0, "%d", 100); exit((r==3 || r==-1)?0:1);])],
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[x_cv_func_snprintf_null_ok=yes],
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[x_cv_func_snprintf_null_ok=no],
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[x_cv_func_snprintf_null_ok=no])])
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fi
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test $x_cv_func_snprintf_null_ok = yes && AC_DEFINE(SNPRINTF_NULL_OK, 1, [Define if snprintf(NULL, 0, ...) works properly])
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])# FUNC_SNPRINTF_NULL_OK
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# FUNC_SNPRINTF([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
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# -------------
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# Checks various aspects of snprintf. In particular:
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# * Does it exist?
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# * Is the size honored?
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# * Is the return value correct?
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# * Is NULL with length 0 ok?
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# If all the above pass, HAVE_WORKING_SNPRINTF is defined and
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# x_cv_func_snprintf_working is set to yes. Otherwise, it's set to no.
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AC_DEFUN([FUNC_SNPRINTF],
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[AC_REQUIRE([FUNC_SNPRINTF_RETVAL])
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AC_REQUIRE([FUNC_SNPRINTF_NULL_OK])
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if test $x_cv_func_snprintf_retval = yes -a $x_cv_func_snprintf_null_ok = yes; then
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AC_DEFINE(HAVE_WORKING_SNPRINTF, 1, [Define if snprintf works properly])
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x_cv_func_snprintf_working=yes
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$1
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else
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x_cv_func_snprintf_working=no
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$2
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fi
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])# FUNC_SNPRINTF
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# FUNC_SNPRINTF_LIBOBJ
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# --------------------
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# If FUNC_SNPRINTF fails, does AC_LIBOBJ
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AC_DEFUN([FUNC_SNPRINTF_LIBOBJ],
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[FUNC_SNPRINTF(, [AC_LIBOBJ([snprintf])
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AC_DEFINE([snprintf], [rpl_snprintf], [Define to rpl_snprintf if the replacement function should be used.])])])
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])#FUNC_SNPRINTF_LIBOBJ
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