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80 lines
2 KiB
C
80 lines
2 KiB
C
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/* See if we have a broken register_printf function (e.g. an old version of glibc) */
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/*
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Copyright (C) 2005 Free Software Foundation
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Copying and distribution of this file, with or without modification,
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are permitted in any medium without royalty provided the copyright
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notice and this notice are preserved.
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*/
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#include <stdio.h>
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#include <printf.h>
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#include <stdarg.h>
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/* <sattler@volker.cs.Uni-Magdeburg.DE>, with libc-5.3.9 thinks this
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flag PRINTF_ATSIGN_VA_LIST should be 0, but for me, with libc-5.0.9,
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it crashes. -mccallum
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Apparently GNU libc 2.xx needs this to be 0 also, along with Linux
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libc versions 5.2.xx and higher (including libc6, which is just GNU
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libc). -chung */
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#define PRINTF_ATSIGN_VA_LIST \
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(defined(_LINUX_C_LIB_VERSION_MINOR) \
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&& _LINUX_C_LIB_VERSION_MAJOR <= 5 \
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&& _LINUX_C_LIB_VERSION_MINOR < 2)
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#if ! PRINTF_ATSIGN_VA_LIST
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static int
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arginfo_func (const struct printf_info *info, size_t n, int *argtypes)
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{
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*argtypes = PA_POINTER;
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return 1;
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}
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#endif /* !PRINTF_ATSIGN_VA_LIST */
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static int
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handle_printf_atsign (FILE *stream,
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const struct printf_info *info,
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#if PRINTF_ATSIGN_VA_LIST
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va_list *ap_pointer)
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#elif defined(_LINUX_C_LIB_VERSION_MAJOR) \
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&& _LINUX_C_LIB_VERSION_MAJOR < 6
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const void **const args)
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#else /* GNU libc needs the following. */
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const void *const *args)
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#endif
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{
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#if ! PRINTF_ATSIGN_VA_LIST
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const void *ptr = *args;
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#endif
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char * string_object;
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int len = 0;
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/* xxx This implementation may not pay pay attention to as much
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of printf_info as it should. */
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#if PRINTF_ATSIGN_VA_LIST
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string_object = va_arg (*ap_pointer, char *);
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#else
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string_object = *((char **) ptr);
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#endif
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if (info->wide == 0)
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len = fprintf(stream, "%s", string_object);
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return len;
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}
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int main()
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{
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char *d = "hi there";
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register_printf_function ('@',
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handle_printf_atsign,
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#if PRINTF_ATSIGN_VA_LIST
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0);
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#else
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arginfo_func);
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#endif
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printf("test %s = %@\n", d, d);
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return 0;
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}
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