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/*-------------------------------------------------------------------------
*
* syswrap.c
* error-throwing wrappers around POSIX functions that rarely fail
*
* Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* src/port/syswrap.c
*
*-------------------------------------------------------------------------
*/
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
/* Prevent recursion */
#undef vsnprintf
#undef snprintf
#undef vsprintf
#undef sprintf
#undef vfprintf
#undef fprintf
#undef printf
/* When the libc primitives are lacking, use our own. */
#ifdef USE_REPL_SNPRINTF
#ifdef __GNUC__
#define vsnprintf(...) pg_vsnprintf(__VA_ARGS__)
#define snprintf(...) pg_snprintf(__VA_ARGS__)
#define vsprintf(...) pg_vsprintf(__VA_ARGS__)
#define sprintf(...) pg_sprintf(__VA_ARGS__)
#define vfprintf(...) pg_vfprintf(__VA_ARGS__)
#define fprintf(...) pg_fprintf(__VA_ARGS__)
#define printf(...) pg_printf(__VA_ARGS__)
#else
#define vsnprintf pg_vsnprintf
#define snprintf pg_snprintf
#define vsprintf pg_vsprintf
#define sprintf pg_sprintf
#define vfprintf pg_vfprintf
#define fprintf pg_fprintf
#define printf pg_printf
#endif
#endif /* USE_REPL_SNPRINTF */
/*
* We abort() in the frontend, rather than exit(), because libpq in particular
* has no business calling exit(). These failures had better be rare.
*/
#ifdef FRONTEND
#define LIB_ERR(func) \
do { \
int discard = fprintf(stderr, "%s failed: %s\n", func, strerror(errno)); \
(void) discard; \
abort(); \
} while (0)
#else
#define LIB_ERR(func) elog(ERROR, "%s failed: %m", func)
#endif
int
vsnprintf_throw_on_fail(char *str, size_t count, const char *fmt, va_list args)
{
int save_errno;
int ret;
/*
* On HP-UX B.11.31, a call that truncates output returns -1 without
* setting errno. (SUSv2 allowed this until the approval of Base Working
* Group Resolution BWG98-006.) We could avoid the save and restore of
* errno on most platforms.
*/
save_errno = errno;
errno = 0;
ret = vsnprintf(str, count, fmt, args);
if (ret < 0 && errno != 0)
LIB_ERR("vsnprintf");
errno = save_errno;
return ret;
}
int
snprintf_throw_on_fail(char *str, size_t count, const char *fmt,...)
{
int ret;
va_list args;
va_start(args, fmt);
ret = vsnprintf_throw_on_fail(str, count, fmt, args);
va_end(args);
return ret;
}
int
vsprintf_throw_on_fail(char *str, const char *fmt, va_list args)
{
int ret;
ret = vsprintf(str, fmt, args);
if (ret < 0)
LIB_ERR("vsprintf");
return ret;
}
int
sprintf_throw_on_fail(char *str, const char *fmt,...)
{
int ret;
va_list args;
va_start(args, fmt);
ret = vsprintf_throw_on_fail(str, fmt, args);
va_end(args);
return ret;
}
int
vfprintf_throw_on_fail(FILE *stream, const char *fmt, va_list args)
{
int ret;
ret = vfprintf(stream, fmt, args);
if (ret < 0)
LIB_ERR("vfprintf");
return ret;
}
int
fprintf_throw_on_fail(FILE *stream, const char *fmt,...)
{
int ret;
va_list args;
va_start(args, fmt);
ret = vfprintf_throw_on_fail(stream, fmt, args);
va_end(args);
return ret;
}
int
printf_throw_on_fail(const char *fmt,...)
{
int ret;
va_list args;
va_start(args, fmt);
ret = vfprintf_throw_on_fail(stdout, fmt, args);
va_end(args);
return ret;
}
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