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build-sys: add c.h with fundamental C definitions

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This file contains various preprocessor directed definitions, and
other definitions, which most programs need.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
This commit is contained in:
Sami Kerola 2011-10-08 22:00:02 +02:00
parent a220ba6770
commit 43318fd0c2
1 changed files with 155 additions and 0 deletions
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include/c.h Normal file
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/*
* Fundamental C definitions.
*/
#ifndef PROCPS_NG_C_H
#define PROCPS_NG_C_H
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#ifdef HAVE_ERR_H
# include <err.h>
#endif
/*
* Compiler specific stuff
*/
#ifndef __GNUC_PREREQ
# if defined __GNUC__ && defined __GNUC_MINOR__
# define __GNUC_PREREQ(maj, min) \
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
# else
# define __GNUC_PREREQ(maj, min) 0
# endif
#endif
/*
* Function attributes
*/
#ifndef __ul_alloc_size
# if __GNUC_PREREQ (4, 3)
# define __ul_alloc_size(s) __attribute__((alloc_size(s)))
# else
# define __ul_alloc_size(s)
# endif
#endif
#ifndef __ul_calloc_size
# if __GNUC_PREREQ (4, 3)
# define __ul_calloc_size(n, s) __attribute__((alloc_size(n, s)))
# else
# define __ul_calloc_size(n, s)
# endif
#endif
/*
* Misc
*/
#ifndef PATH_MAX
# define PATH_MAX 4096
#endif
#ifndef TRUE
# define TRUE 1
#endif
#ifndef FALSE
# define FALSE 0
#endif
/*
* Program name.
*/
#ifndef HAVE_PROGRAM_INVOCATION_SHORT_NAME
# ifdef HAVE___PROGNAME
extern char *__progname;
# define program_invocation_short_name __progname
# else
# ifdef HAVE_GETEXECNAME
# define program_invocation_short_name \
prog_inv_sh_nm_from_file(getexecname(), 0)
# else
# define program_invocation_short_name \
prog_inv_sh_nm_from_file(__FILE__, 1)
# endif
static char prog_inv_sh_nm_buf[256];
static inline char *prog_inv_sh_nm_from_file(char *f, char stripext)
{
char *t;
if ((t = strrchr(f, '/')) != NULL)
t++;
else
t = f;
strncpy(prog_inv_sh_nm_buf, t, sizeof(prog_inv_sh_nm_buf) - 1);
prog_inv_sh_nm_buf[sizeof(prog_inv_sh_nm_buf) - 1] = '\0';
if (stripext && (t = strrchr(prog_inv_sh_nm_buf, '.')) != NULL)
*t = '\0';
return prog_inv_sh_nm_buf;
}
# endif
#endif
/*
* Error printing.
*/
#ifndef HAVE_ERR_H
static inline void
errmsg(char doexit, int excode, char adderr, const char *fmt, ...)
{
fprintf(stderr, "%s: ", program_invocation_short_name);
if (fmt != NULL) {
va_list argp;
va_start(argp, fmt);
vfprintf(stderr, fmt, argp);
va_end(argp);
if (adderr)
fprintf(stderr, ": ");
}
if (adderr)
fprintf(stderr, "%m");
fprintf(stderr, "\n");
if (doexit)
exit(excode);
}
# ifndef HAVE_ERR
# define err(E, FMT...) errmsg(1, E, 1, FMT)
# endif
# ifndef HAVE_ERRX
# define errx(E, FMT...) errmsg(1, E, 0, FMT)
# endif
# ifndef HAVE_WARN
# define warn(FMT...) errmsg(0, 0, 1, FMT)
# endif
# ifndef HAVE_WARNX
# define warnx(FMT...) errmsg(0, 0, 0, FMT)
# endif
#endif /* !HAVE_ERR_H */
/*
* Constant strings for usage() functions.
*/
#define USAGE_HEADER _("\nUsage:\n")
#define USAGE_OPTIONS _("\nOptions:\n")
#define USAGE_SEPARATOR _("\n")
#define USAGE_HELP _(" -h, --help display this help and exit\n")
#define USAGE_VERSION _(" -V, --version output version information and exit\n")
#define USAGE_MAN_TAIL(_man) _("\nFor more details see %s.\n"), _man
#define PROCPS_NG_VERSION _("%s from %s\n"), program_invocation_short_name, PACKAGE_STRING
#endif /* PROCPS_NG_C_H */