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 } 66