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expat

    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/mman.h>
    7: #include <sys/stat.h>
    8: #include <fcntl.h>
    9: #include <errno.h>
   10: #include <string.h>
   11: #include <stdio.h>
   12: #include <unistd.h>
   13: 
   14: #ifndef MAP_FILE
   15: #define MAP_FILE 0
   16: #endif
   17: 
   18: #include "filemap.h"
   19: 
   20: int
   21: filemap(const char *name,
   22:         void (*processor)(const void *, size_t, const char *, void *arg),
   23:         void *arg)
   24: {
   25:   int fd;
   26:   size_t nbytes;
   27:   struct stat sb;
   28:   void *p;
   29: 
   30:   fd = open(name, O_RDONLY);
   31:   if (fd < 0) {
   32:     perror(name);
   33:     return 0;
   34:   }
   35:   if (fstat(fd, &sb) < 0) {
   36:     perror(name);
   37:     close(fd);
   38:     return 0;
   39:   }
   40:   if (!S_ISREG(sb.st_mode)) {
   41:     close(fd);
   42:     fprintf(stderr, "%s: not a regular file\n", name);
   43:     return 0;
   44:   }
   45: 
   46:   nbytes = sb.st_size;
   47:   /* mmap fails for zero length files */
   48:   if (nbytes == 0) {
   49:     static const char c = '\0';
   50:     processor(&c, 0, name, arg);
   51:     close(fd);
   52:     return 1;
   53:   }
   54:   p = (void *)mmap((caddr_t)0, (size_t)nbytes, PROT_READ,
   55:                    MAP_FILE|MAP_PRIVATE, fd, (off_t)0);
   56:   if (p == (void *)-1) {
   57:     perror(name);
   58:     close(fd);
   59:     return 0;
   60:   }
   61:   processor(p, nbytes, name, arg);
   62:   munmap((caddr_t)p, nbytes);
   63:   close(fd);
   64:   return 1;
   65: }