/* $NetBSD: file.c,v 1.11 2019/04/05 13:34:41 christos Exp $ */ /* $FreeBSD: head/usr.bin/grep/file.c 211496 2010-08-19 09:28:59Z des $ */ /* $OpenBSD: file.c,v 1.11 2010/07/02 20:48:48 nicm Exp $ */ /*- * Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav * Copyright (C) 2008-2010 Gabor Kovesdan * Copyright (C) 2010 Dimitry Andric * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if HAVE_NBTOOL_CONFIG_H #include "nbtool_config.h" #endif #include __RCSID("$NetBSD: file.c,v 1.11 2019/04/05 13:34:41 christos Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include "grep.h" #define MAXBUFSIZ (32 * 1024) #define LNBUFBUMP 80 #ifndef WITHOUT_GZIP static gzFile gzbufdesc; #endif #ifndef WITHOUT_BZ2 static BZFILE* bzbufdesc; #endif static unsigned char buffer[MAXBUFSIZ + 1]; static unsigned char *bufpos; static size_t bufrem; static unsigned char *lnbuf; static size_t lnbuflen; static inline int grep_refill(struct file *f) { ssize_t nr = -1; int bzerr; bufpos = buffer; bufrem = 0; #ifndef WITHOUT_GZIP if (filebehave == FILE_GZIP) { nr = gzread(gzbufdesc, buffer, MAXBUFSIZ); if (nr == -1) return -1; } #endif #ifndef WITHOUT_BZ2 if (filebehave == FILE_BZIP && bzbufdesc != NULL) { nr = BZ2_bzRead(&bzerr, bzbufdesc, buffer, MAXBUFSIZ); switch (bzerr) { case BZ_OK: case BZ_STREAM_END: /* No problem, nr will be okay */ break; case BZ_DATA_ERROR_MAGIC: /* * As opposed to gzread(), which simply returns the * plain file data, if it is not in the correct * compressed format, BZ2_bzRead() instead aborts. * * So, just restart at the beginning of the file again, * and use plain reads from now on. */ BZ2_bzReadClose(&bzerr, bzbufdesc); bzbufdesc = NULL; if (lseek(f->fd, 0, SEEK_SET) == -1) return (-1); nr = read(f->fd, buffer, MAXBUFSIZ); break; default: /* Make sure we exit with an error */ nr = -1; } if (nr == -1) return -1; } #endif if (nr == -1) { nr = read(f->fd, buffer, MAXBUFSIZ); } if (nr < 0) return (-1); bufrem = nr; return (0); } static inline void grep_lnbufgrow(size_t newlen) { if (lnbuflen < newlen) { lnbuf = grep_realloc(lnbuf, newlen); lnbuflen = newlen; } } static void grep_copyline(size_t off, size_t len) { memcpy(lnbuf + off, bufpos, len); lnbuf[off + len] = '\0'; } char * grep_fgetln(struct file *f, size_t *lenp) { unsigned char *p; size_t len; size_t off; ptrdiff_t diff; /* Fill the buffer, if necessary */ if (bufrem == 0 && grep_refill(f) != 0) goto error; if (bufrem == 0) { /* Return zero length to indicate EOF */ *lenp = 0; return ((char *)bufpos); } /* Look for a newline in the remaining part of the buffer */ if ((p = memchr(bufpos, line_sep, bufrem)) != NULL) { ++p; /* advance over newline */ len = p - bufpos; grep_lnbufgrow(len + 1); grep_copyline(0, len); *lenp = len; bufrem -= len; bufpos = p; return (char *)lnbuf; } /* We have to copy the current buffered data to the line buffer */ for (len = bufrem, off = 0; ; len += bufrem) { /* Make sure there is room for more data */ grep_lnbufgrow(len + LNBUFBUMP); grep_copyline(off, len - off); off = len; if (grep_refill(f) != 0) goto error; if (bufrem == 0) /* EOF: return partial line */ break; if ((p = memchr(bufpos, line_sep, bufrem)) == NULL) continue; /* got it: finish up the line (like code above) */ ++p; diff = p - bufpos; len += diff; grep_lnbufgrow(len + 1); grep_copyline(off, diff); bufrem -= diff; bufpos = p; break; } *lenp = len; return ((char *)lnbuf); error: *lenp = 0; return (NULL); } static inline struct file * grep_file_init(struct file *f) { #ifndef WITHOUT_GZIP if (filebehave == FILE_GZIP && (gzbufdesc = gzdopen(f->fd, "r")) == NULL) goto error; #endif #ifndef WITHOUT_BZ2 if (filebehave == FILE_BZIP && (bzbufdesc = BZ2_bzdopen(f->fd, "r")) == NULL) goto error; #endif /* Fill read buffer, also catches errors early */ if (grep_refill(f) != 0) goto error; /* Check for binary stuff, if necessary */ if (!nulldataflag && binbehave != BINFILE_TEXT && memchr(bufpos, '\0', bufrem) != NULL) f->binary = true; return (f); error: close(f->fd); free(f); return (NULL); } /* * Opens a file for processing. */ struct file * grep_open(const char *path) { struct file *f; f = grep_malloc(sizeof *f); memset(f, 0, sizeof *f); if (path == NULL) { /* Processing stdin implies --line-buffered. */ lbflag = true; f->fd = STDIN_FILENO; } else if ((f->fd = open(path, O_RDONLY)) == -1) { free(f); return (NULL); } return (grep_file_init(f)); } /* * Closes a file. */ void grep_close(struct file *f) { close(f->fd); /* Reset read buffer and line buffer */ bufpos = buffer; bufrem = 0; free(lnbuf); lnbuf = NULL; lnbuflen = 0; }