66 lines
1.2 KiB
C
66 lines
1.2 KiB
C
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/* Copyright (c) 1998, 1999 Thai Open Source Software Center Ltd
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See the file COPYING for copying permission.
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*/
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#ifndef MAP_FILE
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#define MAP_FILE 0
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#endif
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#include "filemap.h"
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int
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filemap(const char *name,
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void (*processor)(const void *, size_t, const char *, void *arg),
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void *arg)
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{
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int fd;
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size_t nbytes;
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struct stat sb;
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void *p;
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fd = open(name, O_RDONLY);
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if (fd < 0) {
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perror(name);
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return 0;
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}
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if (fstat(fd, &sb) < 0) {
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perror(name);
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close(fd);
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return 0;
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}
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if (!S_ISREG(sb.st_mode)) {
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close(fd);
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fprintf(stderr, "%s: not a regular file\n", name);
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return 0;
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}
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nbytes = sb.st_size;
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/* mmap fails for zero length files */
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if (nbytes == 0) {
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static const char c = '\0';
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processor(&c, 0, name, arg);
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close(fd);
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return 1;
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}
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p = (void *)mmap((caddr_t)0, (size_t)nbytes, PROT_READ,
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MAP_FILE|MAP_PRIVATE, fd, (off_t)0);
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if (p == (void *)-1) {
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perror(name);
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close(fd);
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return 0;
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}
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processor(p, nbytes, name, arg);
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munmap((caddr_t)p, nbytes);
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close(fd);
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return 1;
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}
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