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