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/*************************************************
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* pcregrep program *
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*************************************************/
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/* This is a grep program that uses the PCRE regular expression library to do
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its pattern matching. */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "config.h"
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#include "pcre.h"
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#define FALSE 0
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#define TRUE 1
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typedef int BOOL;
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/*************************************************
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* Global variables *
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*************************************************/
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static pcre *pattern;
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static pcre_extra *hints;
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static BOOL count_only = FALSE;
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static BOOL filenames_only = FALSE;
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static BOOL invert = FALSE;
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static BOOL number = FALSE;
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static BOOL silent = FALSE;
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static BOOL whole_lines = FALSE;
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#if ! HAVE_STRERROR
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/*************************************************
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* Provide strerror() for non-ANSI libraries *
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*************************************************/
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/* Some old-fashioned systems still around (e.g. SunOS4) don't have strerror()
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in their libraries, but can provide the same facility by this simple
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alternative function. */
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extern int sys_nerr;
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extern char *sys_errlist[];
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char *
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strerror(int n)
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{
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if (n < 0 || n >= sys_nerr) return "unknown error number";
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return sys_errlist[n];
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}
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#endif /* HAVE_STRERROR */
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/*************************************************
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* Grep an individual file *
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*************************************************/
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static int
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pcregrep(FILE *in, char *name)
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{
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int rc = 1;
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int linenumber = 0;
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int count = 0;
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int offsets[99];
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char buffer[BUFSIZ];
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while (fgets(buffer, sizeof(buffer), in) != NULL)
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{
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BOOL match;
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int length = (int)strlen(buffer);
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if (length > 0 && buffer[length-1] == '\n') buffer[--length] = 0;
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linenumber++;
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match = pcre_exec(pattern, hints, buffer, length, 0, 0, offsets, 99) >= 0;
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if (match && whole_lines && offsets[1] != length) match = FALSE;
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if (match != invert)
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{
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if (count_only) count++;
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else if (filenames_only)
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{
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fprintf(stdout, "%s\n", (name == NULL)? "<stdin>" : name);
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return 0;
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}
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else if (silent) return 0;
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else
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{
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if (name != NULL) fprintf(stdout, "%s:", name);
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if (number) fprintf(stdout, "%d:", linenumber);
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fprintf(stdout, "%s\n", buffer);
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}
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rc = 0;
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}
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}
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if (count_only)
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{
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if (name != NULL) fprintf(stdout, "%s:", name);
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fprintf(stdout, "%d\n", count);
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}
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return rc;
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}
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/*************************************************
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* Usage function *
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*************************************************/
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static int
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usage(int rc)
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{
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fprintf(stderr, "Usage: pcregrep [-Vchilnsvx] pattern [file] ...\n");
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return rc;
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}
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/*************************************************
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* Main program *
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*************************************************/
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int
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main(int argc, char **argv)
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{
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int i;
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int rc = 1;
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int options = 0;
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int errptr;
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const char *error;
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BOOL filenames = TRUE;
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/* Process the options */
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for (i = 1; i < argc; i++)
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{
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char *s;
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if (argv[i][0] != '-') break;
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s = argv[i] + 1;
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while (*s != 0)
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{
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switch (*s++)
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{
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case 'c': count_only = TRUE; break;
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case 'h': filenames = FALSE; break;
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case 'i': options |= PCRE_CASELESS; break;
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case 'l': filenames_only = TRUE;
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case 'n': number = TRUE; break;
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case 's': silent = TRUE; break;
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case 'v': invert = TRUE; break;
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case 'x': whole_lines = TRUE; options |= PCRE_ANCHORED; break;
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case 'V':
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fprintf(stderr, "PCRE version %s\n", pcre_version());
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break;
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default:
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fprintf(stderr, "pcregrep: unknown option %c\n", s[-1]);
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return usage(2);
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}
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}
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}
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/* There must be at least a regexp argument */
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if (i >= argc) return usage(0);
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/* Compile the regular expression. */
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pattern = pcre_compile(argv[i++], options, &error, &errptr, NULL);
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if (pattern == NULL)
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{
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fprintf(stderr, "pcregrep: error in regex at offset %d: %s\n", errptr, error);
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return 2;
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}
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/* Study the regular expression, as we will be running it may times */
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hints = pcre_study(pattern, 0, &error);
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if (error != NULL)
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{
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fprintf(stderr, "pcregrep: error while studing regex: %s\n", error);
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return 2;
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}
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/* If there are no further arguments, do the business on stdin and exit */
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if (i >= argc) return pcregrep(stdin, NULL);
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/* Otherwise, work through the remaining arguments as files. If there is only
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one, don't give its name on the output. */
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if (i == argc - 1) filenames = FALSE;
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if (filenames_only) filenames = TRUE;
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for (; i < argc; i++)
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{
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FILE *in = fopen(argv[i], "r");
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if (in == NULL)
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{
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fprintf(stderr, "%s: failed to open: %s\n", argv[i], strerror(errno));
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rc = 2;
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}
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else
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{
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int frc = pcregrep(in, filenames? argv[i] : NULL);
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if (frc == 0 && rc == 1) rc = 0;
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fclose(in);
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}
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}
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return rc;
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}
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/* End */
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