1 /* $OpenBSD: file.c,v 1.11 2010/07/02 20:48:48 nicm Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 James Howard and Dag-Erling Co�dan Sm�rgrav 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 31 #include <err.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <zlib.h> 35 #ifdef __minix 36 #include <unistd.h> /* isatty */ 37 #endif /* __minix */ 38 39 #include "grep.h" 40 41 static char fname[MAXPATHLEN]; 42 #ifndef NOZ 43 static char *lnbuf; 44 static size_t lnbuflen; 45 #endif 46 47 #define FILE_STDIO 0 48 #define FILE_MMAP 1 49 #define FILE_GZIP 2 50 51 struct file { 52 int type; 53 int noseek; 54 FILE *f; 55 mmf_t *mmf; 56 gzFile *gzf; 57 }; 58 59 #ifndef NOZ 60 static char * 61 gzfgetln(gzFile *f, size_t *len) 62 { 63 size_t n; 64 int c; 65 66 for (n = 0; ; ++n) { 67 c = gzgetc(f); 68 if (c == -1) { 69 const char *gzerrstr; 70 int gzerr; 71 72 if (gzeof(f)) 73 break; 74 75 gzerrstr = gzerror(f, &gzerr); 76 if (gzerr == Z_ERRNO) 77 err(2, "%s", fname); 78 else 79 errx(2, "%s: %s", fname, gzerrstr); 80 } 81 if (n >= lnbuflen) { 82 lnbuflen *= 2; 83 lnbuf = grep_realloc(lnbuf, ++lnbuflen); 84 } 85 if (c == '\n') 86 break; 87 lnbuf[n] = c; 88 } 89 90 if (gzeof(f) && n == 0) 91 return NULL; 92 *len = n; 93 return lnbuf; 94 } 95 #endif 96 97 file_t * 98 grep_fdopen(int fd, const char *mode) 99 { 100 file_t *f; 101 102 if (fd == STDIN_FILENO) 103 snprintf(fname, sizeof fname, "(standard input)"); 104 else 105 snprintf(fname, sizeof fname, "(fd %d)", fd); 106 107 f = grep_malloc(sizeof *f); 108 109 #ifndef NOZ 110 if (Zflag) { 111 f->type = FILE_GZIP; 112 f->noseek = lseek(fd, 0L, SEEK_SET) == -1; 113 if ((f->gzf = gzdopen(fd, mode)) != NULL) 114 return f; 115 } else 116 #endif 117 { 118 f->type = FILE_STDIO; 119 f->noseek = isatty(fd); 120 if ((f->f = fdopen(fd, mode)) != NULL) 121 return f; 122 } 123 124 free(f); 125 return NULL; 126 } 127 128 file_t * 129 grep_open(const char *path, const char *mode) 130 { 131 file_t *f; 132 133 snprintf(fname, sizeof fname, "%s", path); 134 135 f = grep_malloc(sizeof *f); 136 f->noseek = 0; 137 138 #ifndef NOZ 139 if (Zflag) { 140 f->type = FILE_GZIP; 141 if ((f->gzf = gzopen(fname, mode)) != NULL) 142 return f; 143 } else 144 #endif 145 { 146 #ifndef SMALL 147 /* try mmap first; if it fails, try stdio */ 148 if ((f->mmf = mmopen(fname, mode)) != NULL) { 149 f->type = FILE_MMAP; 150 return f; 151 } 152 #endif 153 f->type = FILE_STDIO; 154 if ((f->f = fopen(path, mode)) != NULL) 155 return f; 156 } 157 158 free(f); 159 return NULL; 160 } 161 162 int 163 grep_bin_file(file_t *f) 164 { 165 if (f->noseek) 166 return 0; 167 168 switch (f->type) { 169 case FILE_STDIO: 170 return bin_file(f->f); 171 #ifndef SMALL 172 case FILE_MMAP: 173 return mmbin_file(f->mmf); 174 #endif 175 #ifndef NOZ 176 case FILE_GZIP: 177 return gzbin_file(f->gzf); 178 #endif 179 default: 180 /* can't happen */ 181 errx(2, "invalid file type"); 182 } 183 } 184 185 char * 186 grep_fgetln(file_t *f, size_t *l) 187 { 188 switch (f->type) { 189 case FILE_STDIO: 190 return fgetln(f->f, l); 191 #ifndef SMALL 192 case FILE_MMAP: 193 return mmfgetln(f->mmf, l); 194 #endif 195 #ifndef NOZ 196 case FILE_GZIP: 197 return gzfgetln(f->gzf, l); 198 #endif 199 default: 200 /* can't happen */ 201 errx(2, "invalid file type"); 202 } 203 } 204 205 void 206 grep_close(file_t *f) 207 { 208 switch (f->type) { 209 case FILE_STDIO: 210 fclose(f->f); 211 break; 212 #ifndef SMALL 213 case FILE_MMAP: 214 mmclose(f->mmf); 215 break; 216 #endif 217 #ifndef NOZ 218 case FILE_GZIP: 219 gzclose(f->gzf); 220 break; 221 #endif 222 default: 223 /* can't happen */ 224 errx(2, "invalid file type"); 225 } 226 free(f); 227 } 228