w3d/tools/psnr/error.c

   1 /*  very simple error handling functions */
   2
   3 #include <stdarg.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <errno.h>
   7
   8 #include "error.h"
   9
  10 /* print "ERROR: " followed by error msg "fmt", a printf style format string */
  11 void
  12 error(char *fmt, ...)
  13 {
  14         va_list ap;
  15
  16         (void) fflush(stdout);
  17         fprintf(stderr, "ERROR: ");
  18
  19         va_start(ap, fmt);
  20         (void) vfprintf(stderr, fmt, ap);
  21         va_end(ap);
  22
  23         (void) putc('\n', stderr);
  24 }
  25
  26 /* call error and die */
  27 void
  28 fatal(char *fmt, ...)
  29 {
  30         va_list ap;
  31
  32         (void) fflush(stdout);
  33         fprintf(stderr, "ERROR: ");
  34
  35         va_start(ap, fmt);
  36         (void) vfprintf(stderr, fmt, ap);
  37         va_end(ap);
  38
  39         (void) putc('\n', stderr);
  40         exit(EXIT_FAILURE);
  41 }
  42
  43 void *
  44 emalloc(size_t size)
  45 {
  46         register void *p = malloc(size);
  47
  48         if (p == 0)
  49                 fatal("out of memory");
  50         return p;
  51 }
  52
  53 void *
  54 erealloc(void *ptr, size_t size)
  55 {
  56         if (0 == ptr)
  57                 return emalloc(size);
  58         if (0 == size) {
  59                 free(ptr);
  60                 return 0;
  61         }
  62         ptr = realloc(ptr, size);
  63         if (0 == ptr)
  64                 fatal("out of memory");
  65
  66         return ptr;
  67 }
  68
  69 FILE *
  70 efopen(const char *path, const char *mode)
  71 {
  72         FILE *p = fopen(path, mode);
  73         if (p == 0) {
  74                 perror("efopen");
  75                 error("unable to open file: %s", path);
  76         }
  77         return p;
  78 }