src/expat/xmlwf/readfilemap.c

   1 /* Copyright (c) 1998, 1999 Thai Open Source Software Center Ltd
   2    See the file COPYING for copying permission.
   3 */
   4
   5 #include <sys/types.h>
   6 #include <sys/stat.h>
   7 #include <fcntl.h>
   8 #include <stdlib.h>
   9 #include <stdio.h>
  10
  11 #ifdef __WATCOMC__
  12 #ifndef __LINUX__
  13 #include <io.h>
  14 #else
  15 #include <unistd.h>
  16 #endif
  17 #endif
  18
  19 #ifdef __BEOS__
  20 #include <unistd.h>
  21 #endif
  22
  23 #ifndef S_ISREG
  24 #ifndef S_IFREG
  25 #define S_IFREG _S_IFREG
  26 #endif
  27 #ifndef S_IFMT
  28 #define S_IFMT _S_IFMT
  29 #endif
  30 #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
  31 #endif /* not S_ISREG */
  32
  33 #ifndef O_BINARY
  34 #ifdef _O_BINARY
  35 #define O_BINARY _O_BINARY
  36 #else
  37 #define O_BINARY 0
  38 #endif
  39 #endif
  40
  41 #include "filemap.h"
  42
  43 int
  44 filemap(const char *name,
  45         void (*processor)(const void *, size_t, const char *, void *arg),
  46         void *arg)
  47 {
  48   size_t nbytes;
  49   int fd;
  50   int n;
  51   struct stat sb;
  52   void *p;
  53
  54   fd = open(name, O_RDONLY|O_BINARY);
  55   if (fd < 0) {
  56     perror(name);
  57     return 0;
  58   }
  59   if (fstat(fd, &sb) < 0) {
  60     perror(name);
  61     close(fd);
  62     return 0;
  63   }
  64   if (!S_ISREG(sb.st_mode)) {
  65     fprintf(stderr, "%s: not a regular file\n", name);
  66     close(fd);
  67     return 0;
  68   }
  69   nbytes = sb.st_size;
  70   /* malloc will return NULL with nbytes == 0, handle files with size 0 */
  71   if (nbytes == 0) {
  72     static const char c = '\0';
  73     processor(&c, 0, name, arg);
  74     close(fd);
  75     return 1;
  76   }
  77   p = malloc(nbytes);
  78   if (!p) {
  79     fprintf(stderr, "%s: out of memory\n", name);
  80     close(fd);
  81     return 0;
  82   }
  83   n = read(fd, p, nbytes);
  84   if (n < 0) {
  85     perror(name);
  86     free(p);
  87     close(fd);
  88     return 0;
  89   }
  90   if (n != nbytes) {
  91     fprintf(stderr, "%s: read unexpected number of bytes\n", name);
  92     free(p);
  93     close(fd);
  94     return 0;
  95   }
  96   processor(p, nbytes, name, arg);
  97   free(p);
  98   close(fd);
  99   return 1;
 100 }