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