tags/pcre-1.02/pgrep.c

/*************************************************
*               PCRE grep program                *
*************************************************/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.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;


#ifdef STRERROR_FROM_ERRLIST
/*************************************************
*     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 /* STRERROR_FROM_ERRLIST */


/*************************************************
*              Grep an individual file           *
*************************************************/

static int
pgrep(FILE *in, char *name)
{
int rc = 1;
int linenumber = 0;
int count = 0;
int offsets[2];
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, offsets, 2) >= 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 [-chilnsvx] 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;
      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);
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 */
1	/*************************************************
2	* PCRE grep program *
3	*************************************************/
4
5	#include <stdio.h>
6	#include <string.h>
7	#include <stdlib.h>
8	#include <errno.h>
9	#include "pcre.h"
10
11
12	#define FALSE 0
13	#define TRUE 1
14
15	typedef int BOOL;
16
17
18
19	/*************************************************
20	* Global variables *
21	*************************************************/
22
23	static pcre *pattern;
24	static pcre_extra *hints;
25
26	static BOOL count_only = FALSE;
27	static BOOL filenames_only = FALSE;
28	static BOOL invert = FALSE;
29	static BOOL number = FALSE;
30	static BOOL silent = FALSE;
31	static BOOL whole_lines = FALSE;
32
33
34
35	#ifdef STRERROR_FROM_ERRLIST
36	/*************************************************
37	* Provide strerror() for non-ANSI libraries *
38	*************************************************/
39
40	/* Some old-fashioned systems still around (e.g. SunOS4) don't have strerror()
41	in their libraries, but can provide the same facility by this simple
42	alternative function. */
43
44	extern int sys_nerr;
45	extern char *sys_errlist[];
46
47	char *
48	strerror(int n)
49	{
50	if (n < 0 \|\| n >= sys_nerr) return "unknown error number";
51	return sys_errlist[n];
52	}
53	#endif /* STRERROR_FROM_ERRLIST */
54
55
56
57	/*************************************************
58	* Grep an individual file *
59	*************************************************/
60
61	static int
62	pgrep(FILE in, char name)
63	{
64	int rc = 1;
65	int linenumber = 0;
66	int count = 0;
67	int offsets[2];
68	char buffer[BUFSIZ];
69
70	while (fgets(buffer, sizeof(buffer), in) != NULL)
71	{
72	BOOL match;
73	int length = (int)strlen(buffer);
74	if (length > 0 && buffer[length-1] == '\n') buffer[--length] = 0;
75	linenumber++;
76
77	match = pcre_exec(pattern, hints, buffer, length, 0, offsets, 2) >= 0;
78	if (match && whole_lines && offsets[1] != length) match = FALSE;
79
80	if (match != invert)
81	{
82	if (count_only) count++;
83
84	else if (filenames_only)
85	{
86	fprintf(stdout, "%s\n", (name == NULL)? "<stdin>" : name);
87	return 0;
88	}
89
90	else if (silent) return 0;
91
92	else
93	{
94	if (name != NULL) fprintf(stdout, "%s:", name);
95	if (number) fprintf(stdout, "%d:", linenumber);
96	fprintf(stdout, "%s\n", buffer);
97	}
98
99	rc = 0;
100	}
101	}
102
103	if (count_only)
104	{
105	if (name != NULL) fprintf(stdout, "%s:", name);
106	fprintf(stdout, "%d\n", count);
107	}
108
109	return rc;
110	}
111
112
113
114
115	/*************************************************
116	* Usage function *
117	*************************************************/
118
119	static int
120	usage(int rc)
121	{
122	fprintf(stderr, "Usage: pgrep [-chilnsvx] pattern [file] ...\n");
123	return rc;
124	}
125
126
127
128
129	/*************************************************
130	* Main program *
131	*************************************************/
132
133	int
134	main(int argc, char **argv)
135	{
136	int i;
137	int rc = 1;
138	int options = 0;
139	int errptr;
140	const char *error;
141	BOOL filenames = TRUE;
142
143	/* Process the options */
144
145	for (i = 1; i < argc; i++)
146	{
147	char *s;
148	if (argv[i][0] != '-') break;
149	s = argv[i] + 1;
150	while (*s != 0)
151	{
152	switch (*s++)
153	{
154	case 'c': count_only = TRUE; break;
155	case 'h': filenames = FALSE; break;
156	case 'i': options \|= PCRE_CASELESS; break;
157	case 'l': filenames_only = TRUE;
158	case 'n': number = TRUE; break;
159	case 's': silent = TRUE; break;
160	case 'v': invert = TRUE; break;
161	case 'x': whole_lines = TRUE; options \|= PCRE_ANCHORED; break;
162	default:
163	fprintf(stderr, "pgrep: unknown option %c\n", s[-1]);
164	return usage(2);
165	}
166	}
167	}
168
169	/* There must be at least a regexp argument */
170
171	if (i >= argc) return usage(0);
172
173	/* Compile the regular expression. */
174
175	pattern = pcre_compile(argv[i++], options, &error, &errptr);
176	if (pattern == NULL)
177	{
178	fprintf(stderr, "pgrep: error in regex at offset %d: %s\n", errptr, error);
179	return 2;
180	}
181
182	/* Study the regular expression, as we will be running it may times */
183
184	hints = pcre_study(pattern, 0, &error);
185	if (error != NULL)
186	{
187	fprintf(stderr, "pgrep: error while studing regex: %s\n", error);
188	return 2;
189	}
190
191	/* If there are no further arguments, do the business on stdin and exit */
192
193	if (i >= argc) return pgrep(stdin, NULL);
194
195	/* Otherwise, work through the remaining arguments as files. If there is only
196	one, don't give its name on the output. */
197
198	if (i == argc - 1) filenames = FALSE;
199	if (filenames_only) filenames = TRUE;
200
201	for (; i < argc; i++)
202	{
203	FILE *in = fopen(argv[i], "r");
204	if (in == NULL)
205	{
206	fprintf(stderr, "%s: failed to open: %s\n", argv[i], strerror(errno));
207	rc = 2;
208	}
209	else
210	{
211	int frc = pgrep(in, filenames? argv[i] : NULL);
212	if (frc == 0 && rc == 1) rc = 0;
213	fclose(in);
214	}
215	}
216
217	return rc;
218	}
219
220	/* End */