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

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

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

diff --git a/include/c.h b/include/c.h
new file mode 100644 (file)
index 0000000..86e56d2
--- /dev/null
+++ b/include/c.h
@@ -0,0 +1,155 @@
+/*
+ * 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 */