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