mdw@git.distorted.org.uk Git - become/blob - src/utils.c

   1 /* -*-c-*-
   2  *
   3  * $Id: utils.c,v 1.1 1997/07/21 13:47:42 mdw Exp $
   4  *
   5  * Miscellaneous useful bits of code.
   6  *
   7  * (c) 1997 Mark Wooding
   8  */
   9
  10 /*----- Licencing notice --------------------------------------------------*
  11  *
  12  * This file is part of `become'
  13  *
  14  * `Become' is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * `Become' is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with `become'; if not, write to the Free Software
  26  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27  */
  28
  29 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: utils.c,v $
  32  * Revision 1.1  1997/07/21 13:47:42  mdw
  33  * Initial revision
  34  *
  35  */
  36
  37 /*----- Header files ------------------------------------------------------*/
  38
  39 /* --- ANSI headers --- */
  40
  41 #include <stdarg.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44
  45 /* --- Local headers --- */
  46
  47 #include "config.h"
  48 #include "utils.h"
  49
  50 /*----- Static data -------------------------------------------------------*/
  51
  52 static const char *myname = 0;          /* What's my name? */
  53
  54 /*----- Program name handling ---------------------------------------------*/
  55
  56 /* --- @quis@ --- *
  57  *
  58  * Arguments:   ---
  59  *
  60  * Returns:     Pointer to the program name.
  61  *
  62  * Use:         Returns the program name.
  63  */
  64
  65 const char *quis(void)
  66 {
  67   return (myname);
  68 }
  69
  70 /* --- @ego@ --- *
  71  *
  72  * Arguments:   @const char *p@ = pointer to program name
  73  *
  74  * Returns:     ---
  75  *
  76  * Use:         Tells the utils library what the program's name is.
  77  */
  78
  79 #ifndef PATHSEP
  80 #  if defined(__riscos)
  81 #    define PATHSEP '.'
  82 #  elif defined(__unix) || defined(unix)
  83 #    define PATHSEP '/'
  84 #  else
  85 #    define PATHSEP '\\'
  86 #  endif
  87 #endif
  88
  89 void ego(const char *p)
  90 {
  91   const char *q = p;
  92   while (*q) {
  93     if (*q++ == PATHSEP)
  94       p = q;
  95   }
  96   myname = p;
  97 }
  98
  99 /*----- Error reporting ---------------------------------------------------*/
 100
 101 /* --- @moan@ --- *
 102  *
 103  * Arguments:   @const char *f@ = a @printf@-style format string
 104  *              @...@ = other arguments
 105  *
 106  * Returns:     ---
 107  *
 108  * Use:         Reports an error.
 109  */
 110
 111 void moan(const char *f, ...)
 112 {
 113   va_list ap;
 114   va_start(ap, f);
 115   fprintf(stderr, "%s: ", myname);
 116   vfprintf(stderr, f, ap);
 117   va_end(ap);
 118   putc('\n', stderr);
 119 }
 120
 121 /* --- @die@ --- *
 122  *
 123  * Arguments:   @const char *f@ = a @printf@-style format string
 124  *              @...@ = other arguments
 125  *
 126  * Returns:     Never.
 127  *
 128  * Use:         Reports an error and hari-kiris.  Like @moan@ above, only
 129  *              more permanent.
 130  */
 131
 132 void die(const char *f, ...)
 133 {
 134   va_list ap;
 135   va_start(ap, f);
 136   fprintf(stderr, "%s: ", myname);
 137   vfprintf(stderr, f, ap);
 138   va_end(ap);
 139   putc('\n', stderr);
 140   exit(EXIT_FAILURE);
 141 }
 142
 143 /*----- Memory management functions ---------------------------------------*/
 144
 145 /* --- @xmalloc@ --- *
 146  *
 147  * Arguments:   @size_t sz@ = size of block to allocate
 148  *
 149  * Returns:     Pointer to allocated block.
 150  *
 151  * Use:         Allocates memory.  If the memory isn't available, we don't
 152  *              hang aroung long enough for a normal function return.
 153  */
 154
 155 void *xmalloc(size_t sz)
 156 {
 157   void *p = malloc(sz);
 158   if (!p)
 159     die("not enough memory");
 160   return (p);
 161 }
 162
 163 /* --- @xstrdup@ --- *
 164  *
 165  * Arguments:   @const char *s@ = pointer to a string
 166  *
 167  * Returns:     Pointer to a copy of the string.
 168  *
 169  * Use:         Copies a string (like @strdup@ would, if it existed).
 170  */
 171
 172 char *xstrdup(const char *s)
 173 {
 174   size_t sz = strlen(s) + 1;
 175   char *p = xmalloc(sz);
 176   memcpy(p, s, sz);
 177   return (p);
 178 }
 179
 180 /* --- @xrealloc@ --- *
 181  *
 182  * Arguments:   @void *p@ = pointer to a block of memory
 183  *              @size_t sz@ = new size desired for the block
 184  *
 185  * Returns:     Pointer to the resized memory block (which is almost
 186  *              certainly not in the same place any more).
 187  *
 188  * Use:         Resizes a memory block.
 189  */
 190
 191 void *xrealloc(void *p, size_t sz)
 192 {
 193   p = realloc(p, sz);
 194   if (!p)
 195     die("not enough memory");
 196   return (p);
 197 }
 198
 199 /*----- That's all, folks -------------------------------------------------*/