util.c

   1 /*
   2  * (c) 2010 Cyrill Gorcunov, gorcunov@gmail.com
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or (at
   7  * your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  */
  19
  20 #include <unistd.h>
  21 #include <stdio.h>
  22 #include <stddef.h>
  23 #include <stdlib.h>
  24 #include <stdarg.h>
  25 #include <string.h>
  26 #include <errno.h>
  27 #include <limits.h>
  28 #include <sys/param.h>
  29 #include <sys/types.h>
  30
  31 #include "util.h"
  32
  33 static void report(const char *prefix, const char *err, va_list params)
  34 {
  35         char msg[1024];
  36         vsnprintf(msg, sizeof(msg), err, params);
  37         fprintf(stderr, " %s%s\n", prefix, msg);
  38 }
  39
  40 static NORETURN void die_builtin(const char *err, va_list params)
  41 {
  42         report(" Fatal: ", err, params);
  43         exit(128);
  44 }
  45
  46 static void error_builtin(const char *err, va_list params)
  47 {
  48         report(" Error: ", err, params);
  49 }
  50
  51 static void warn_builtin(const char *warn, va_list params)
  52 {
  53         report(" Warning: ", warn, params);
  54 }
  55
  56 static void debug_builtin(const char *info, va_list params)
  57 {
  58         report(" Debug: ", info, params);
  59 }
  60
  61 void die(const char *err, ...)
  62 {
  63         va_list params;
  64
  65         va_start(params, err);
  66         die_builtin(err, params);
  67         va_end(params);
  68 }
  69
  70 int error(const char *err, ...)
  71 {
  72         va_list params;
  73
  74         va_start(params, err);
  75         error_builtin(err, params);
  76         va_end(params);
  77         return -1;
  78 }
  79
  80 void warning(const char *warn, ...)
  81 {
  82         va_list params;
  83
  84         va_start(params, warn);
  85         warn_builtin(warn, params);
  86         va_end(params);
  87 }
  88
  89 void debug(const char *info, ...)
  90 {
  91         va_list params;
  92
  93         va_start(params, info);
  94         debug_builtin(info, params);
  95         va_end(params);
  96 }
  97
  98 void die_perror(const char *s)
  99 {
 100         perror(s);
 101         exit(1);
 102 }
 103
 104 /**
 105  * strlcat - Append a length-limited, %NUL-terminated string to another
 106  * @dest: The string to be appended to
 107  * @src: The string to append to it
 108  * @count: The size of the destination buffer.
 109  */
 110 size_t strlcat(char *dest, const char *src, size_t count)
 111 {
 112         size_t dsize = strlen(dest);
 113         size_t len = strlen(src);
 114         size_t res = dsize + len;
 115
 116         DIE_IF(dsize >= count);
 117
 118         dest += dsize;
 119         count -= dsize;
 120         if (len >= count)
 121                 len = count - 1;
 122
 123         memcpy(dest, src, len);
 124         dest[len] = 0;
 125
 126         return res;
 127 }
 128