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Added support for grep -e and grep -f, closes bug #1164. Also added some

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testcases for these new features.
This commit is contained in:
Mark Whitley 2001-05-24 18:36:18 +00:00
parent 04052f96e1
commit fa43e54b6f
3 changed files with 274 additions and 179 deletions
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225
findutils/grep.c
View File

@ -34,13 +34,13 @@ extern int errno; /* for use with strerror() */
extern void xregcomp(regex_t *preg, const char *regex, int cflags); /* in busybox.h */ extern void xregcomp(regex_t *preg, const char *regex, int cflags); /* in busybox.h */
/* options */ /* options */
static int ignore_case = 0; static int reflags = REG_NOSUB;
static int print_filename = 0; static int print_filename = 0;
static int print_line_num = 0; static int print_line_num = 0;
static int print_match_counts = 0; static int print_match_counts = 0;
static int be_quiet = 0; static int be_quiet = 0;
static int invert_search = 0; static int invert_search = 0;
static int suppress_err_msgs = 0; static int suppress_err_msgs = 0;
static int print_files_with_matches = 0; static int print_files_with_matches = 0;
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
@ -52,10 +52,12 @@ static int last_line_printed = 0;
#endif /* BB_FEATURE_GREP_CONTEXT */ #endif /* BB_FEATURE_GREP_CONTEXT */
/* globals used internally */ /* globals used internally */
static regex_t regex; /* storage space for compiled regular expression */ static regex_t *regexes = NULL; /* growable array of compiled regular expressions */
static int nregexes = 0; /* number of elements in above arrary */
static int matched; /* keeps track of whether we ever matched */ static int matched; /* keeps track of whether we ever matched */
static char *cur_file = NULL; /* the current file we are reading */ static char *cur_file = NULL; /* the current file we are reading */
static void print_line(const char *line, int linenum, char decoration) static void print_line(const char *line, int linenum, char decoration)
{ {
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
@ -73,12 +75,14 @@ static void print_line(const char *line, int linenum, char decoration)
puts(line); puts(line);
} }
static void grep_file(FILE *file) static void grep_file(FILE *file)
{ {
char *line = NULL; char *line = NULL;
int ret; int ret;
int linenum = 0; int linenum = 0;
int nmatches = 0; int nmatches = 0;
int i;
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
int print_n_lines_after = 0; int print_n_lines_after = 0;
int curpos = 0; /* track where we are in the circular 'before' buffer */ int curpos = 0; /* track where we are in the circular 'before' buffer */
@ -89,81 +93,81 @@ static void grep_file(FILE *file)
chomp(line); chomp(line);
linenum++; linenum++;
/* for (i = 0; i < nregexes; i++) {
* test for a postitive-assertion match (regexec returns success (0) /*
* and the user did not specify invert search), or a negative-assertion * test for a postitive-assertion match (regexec returns success (0)
* match (regexec returns failure (REG_NOMATCH) and the user specified * and the user did not specify invert search), or a negative-assertion
* invert search) * match (regexec returns failure (REG_NOMATCH) and the user specified
*/ * invert search)
ret = regexec(&regex, line, 0, NULL, 0); */
if ((ret == 0 && !invert_search) || (ret == REG_NOMATCH && invert_search)) { ret = regexec(&regexes[i], line, 0, NULL, 0);
if ((ret == 0 && !invert_search) || (ret == REG_NOMATCH && invert_search)) {
/* if we found a match but were told to be quiet, stop here and /* if we found a match but were told to be quiet, stop here and
* return success */ * return success */
if (be_quiet) { if (be_quiet)
regfree(&regex); exit(0);
exit(0);
}
/* keep track of matches */ /* keep track of matches */
nmatches++; nmatches++;
/* if we're just printing filenames, we stop after the first match */ /* if we're just printing filenames, we stop after the first match */
if (print_files_with_matches) if (print_files_with_matches)
break; break;
/* print the matched line */ /* print the matched line */
if (print_match_counts == 0) { if (print_match_counts == 0) {
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1; int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
/* if we were told to print 'before' lines and there is at least /* if we were told to print 'before' lines and there is at least
* one line in the circular buffer, print them */ * one line in the circular buffer, print them */
if (lines_before && before_buf[prevpos] != NULL) { if (lines_before && before_buf[prevpos] != NULL) {
int first_buf_entry_line_num = linenum - lines_before; int first_buf_entry_line_num = linenum - lines_before;
/* advance to the first entry in the circular buffer, and /* advance to the first entry in the circular buffer, and
* figure out the line number is of the first line in the * figure out the line number is of the first line in the
* buffer */ * buffer */
idx = curpos; idx = curpos;
while (before_buf[idx] == NULL) { while (before_buf[idx] == NULL) {
idx = (idx + 1) % lines_before; idx = (idx + 1) % lines_before;
first_buf_entry_line_num++; first_buf_entry_line_num++;
}
/* now print each line in the buffer, clearing them as we go */
while (before_buf[idx] != NULL) {
print_line(before_buf[idx], first_buf_entry_line_num, '-');
free(before_buf[idx]);
before_buf[idx] = NULL;
idx = (idx + 1) % lines_before;
first_buf_entry_line_num++;
}
} }
/* now print each line in the buffer, clearing them as we go */ /* make a note that we need to print 'after' lines */
while (before_buf[idx] != NULL) { print_n_lines_after = lines_after;
print_line(before_buf[idx], first_buf_entry_line_num, '-'); #endif /* BB_FEATURE_GREP_CONTEXT */
free(before_buf[idx]); print_line(line, linenum, ':');
before_buf[idx] = NULL;
idx = (idx + 1) % lines_before;
first_buf_entry_line_num++;
}
} }
/* make a note that we need to print 'after' lines */
print_n_lines_after = lines_after;
#endif /* BB_FEATURE_GREP_CONTEXT */
print_line(line, linenum, ':');
} }
}
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
else { /* no match */ else { /* no match */
/* Add the line to the circular 'before' buffer */ /* Add the line to the circular 'before' buffer */
if(lines_before) { if(lines_before) {
if(before_buf[curpos]) if(before_buf[curpos])
free(before_buf[curpos]); free(before_buf[curpos]);
before_buf[curpos] = strdup(line); before_buf[curpos] = strdup(line);
curpos = (curpos + 1) % lines_before; curpos = (curpos + 1) % lines_before;
}
} }
}
/* if we need to print some context lines after the last match, do so */ /* if we need to print some context lines after the last match, do so */
if (print_n_lines_after && (last_line_printed != linenum)) { if (print_n_lines_after && (last_line_printed != linenum)) {
print_line(line, linenum, '-'); print_line(line, linenum, '-');
print_n_lines_after--; print_n_lines_after--;
} }
#endif /* BB_FEATURE_GREP_CONTEXT */ #endif /* BB_FEATURE_GREP_CONTEXT */
} /* for */
free(line); free(line);
} }
@ -189,23 +193,63 @@ static void grep_file(FILE *file)
matched = 1; matched = 1;
} }
static void add_regex(const char *restr)
{
regexes = xrealloc(regexes, sizeof(regex_t) * (++nregexes));
xregcomp(&regexes[nregexes-1], restr, reflags);
}
static void load_regexes_from_file(const char *filename)
{
char *line;
FILE *f = xfopen(filename, "r");
while ((line = get_line_from_file(f)) != NULL) {
chomp(line);
add_regex(line);
free(line);
}
}
#ifdef BB_FEATURE_CLEAN_UP
static void destroy_regexes()
{
if (regexes == NULL)
return;
/* destroy all the elments in the array */
while (--nregexes >= 0) {
regfree(regexes[nregexes]);
free(regexes[nregexes]);
}
}
#endif
extern int grep_main(int argc, char **argv) extern int grep_main(int argc, char **argv)
{ {
int opt; int opt;
int reflags;
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
char *junk; char *junk;
#endif #endif
#ifdef BB_FEATURE_CLEAN_UP
/* destroy command strings on exit */
if (atexit(destroy_regexes) == -1)
perror_msg_and_die("atexit");
#endif
/* do normal option parsing */ /* do normal option parsing */
while ((opt = getopt(argc, argv, "iHhlnqvsc" while ((opt = getopt(argc, argv, "iHhlnqvsce:f:"
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
"A:B:C:" "A:B:C:"
#endif #endif
)) > 0) { )) > 0) {
switch (opt) { switch (opt) {
case 'i': case 'i':
ignore_case++; reflags |= REG_ICASE;
break; break;
case 'l': case 'l':
print_files_with_matches++; print_files_with_matches++;
@ -231,6 +275,12 @@ extern int grep_main(int argc, char **argv)
case 'c': case 'c':
print_match_counts++; print_match_counts++;
break; break;
case 'e':
add_regex(optarg);
break;
case 'f':
load_regexes_from_file(optarg);
break;
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
case 'A': case 'A':
lines_after = strtoul(optarg, &junk, 10); lines_after = strtoul(optarg, &junk, 10);
@ -255,11 +305,18 @@ extern int grep_main(int argc, char **argv)
} }
} }
/* argv[optind] should be the regex pattern; no pattern, no worky */ /* if we didn't get a pattern from a -e and no command file was specified,
if (argv[optind] == NULL) * argv[optind] should be the pattern. no pattern, no worky */
show_usage(); if (nregexes == 0) {
if (argv[optind] == NULL)
show_usage();
else {
add_regex(argv[optind]);
optind++;
}
}
/* sanity check */ /* sanity checks */
if (print_match_counts || be_quiet || print_files_with_matches) { if (print_match_counts || be_quiet || print_files_with_matches) {
print_line_num = 0; print_line_num = 0;
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
@ -268,28 +325,20 @@ extern int grep_main(int argc, char **argv)
#endif #endif
} }
/* compile the regular expression /* argv[(optind)..(argc-1)] should be names of file to grep through. If
* we're not going to mess with sub-expressions, and we need to
* treat newlines right. */
reflags = REG_NOSUB;
if (ignore_case)
reflags |= REG_ICASE;
xregcomp(&regex, argv[optind], reflags);
/* argv[(optind+1)..(argc-1)] should be names of file to grep through. If
* there is more than one file to grep, we will print the filenames */ * there is more than one file to grep, we will print the filenames */
if ((argc-1) - (optind+1) > 0) if ((argc-1) - (optind) > 0)
print_filename++; print_filename++;
/* If no files were specified, or '-' was specified, take input from /* If no files were specified, or '-' was specified, take input from
* stdin. Otherwise, we grep through all the files specified. */ * stdin. Otherwise, we grep through all the files specified. */
if (argv[optind+1] == NULL || (strcmp(argv[optind+1], "-") == 0)) { if (argv[optind] == NULL || (strcmp(argv[optind], "-") == 0)) {
grep_file(stdin); grep_file(stdin);
} }
else { else {
int i; int i;
FILE *file; FILE *file;
for (i = optind + 1; i < argc; i++) { for (i = optind; i < argc; i++) {
cur_file = argv[i]; cur_file = argv[i];
file = fopen(cur_file, "r"); file = fopen(cur_file, "r");
if (file == NULL) { if (file == NULL) {
@ -303,7 +352,5 @@ extern int grep_main(int argc, char **argv)
} }
} }
regfree(&regex);
return !matched; /* invert return value 0 = success, 1 = failed */ return !matched; /* invert return value 0 = success, 1 = failed */
} }

225
grep.c
View File

@ -34,13 +34,13 @@ extern int errno; /* for use with strerror() */
extern void xregcomp(regex_t *preg, const char *regex, int cflags); /* in busybox.h */ extern void xregcomp(regex_t *preg, const char *regex, int cflags); /* in busybox.h */
/* options */ /* options */
static int ignore_case = 0; static int reflags = REG_NOSUB;
static int print_filename = 0; static int print_filename = 0;
static int print_line_num = 0; static int print_line_num = 0;
static int print_match_counts = 0; static int print_match_counts = 0;
static int be_quiet = 0; static int be_quiet = 0;
static int invert_search = 0; static int invert_search = 0;
static int suppress_err_msgs = 0; static int suppress_err_msgs = 0;
static int print_files_with_matches = 0; static int print_files_with_matches = 0;
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
@ -52,10 +52,12 @@ static int last_line_printed = 0;
#endif /* BB_FEATURE_GREP_CONTEXT */ #endif /* BB_FEATURE_GREP_CONTEXT */
/* globals used internally */ /* globals used internally */
static regex_t regex; /* storage space for compiled regular expression */ static regex_t *regexes = NULL; /* growable array of compiled regular expressions */
static int nregexes = 0; /* number of elements in above arrary */
static int matched; /* keeps track of whether we ever matched */ static int matched; /* keeps track of whether we ever matched */
static char *cur_file = NULL; /* the current file we are reading */ static char *cur_file = NULL; /* the current file we are reading */
static void print_line(const char *line, int linenum, char decoration) static void print_line(const char *line, int linenum, char decoration)
{ {
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
@ -73,12 +75,14 @@ static void print_line(const char *line, int linenum, char decoration)
puts(line); puts(line);
} }
static void grep_file(FILE *file) static void grep_file(FILE *file)
{ {
char *line = NULL; char *line = NULL;
int ret; int ret;
int linenum = 0; int linenum = 0;
int nmatches = 0; int nmatches = 0;
int i;
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
int print_n_lines_after = 0; int print_n_lines_after = 0;
int curpos = 0; /* track where we are in the circular 'before' buffer */ int curpos = 0; /* track where we are in the circular 'before' buffer */
@ -89,81 +93,81 @@ static void grep_file(FILE *file)
chomp(line); chomp(line);
linenum++; linenum++;
/* for (i = 0; i < nregexes; i++) {
* test for a postitive-assertion match (regexec returns success (0) /*
* and the user did not specify invert search), or a negative-assertion * test for a postitive-assertion match (regexec returns success (0)
* match (regexec returns failure (REG_NOMATCH) and the user specified * and the user did not specify invert search), or a negative-assertion
* invert search) * match (regexec returns failure (REG_NOMATCH) and the user specified
*/ * invert search)
ret = regexec(&regex, line, 0, NULL, 0); */
if ((ret == 0 && !invert_search) || (ret == REG_NOMATCH && invert_search)) { ret = regexec(&regexes[i], line, 0, NULL, 0);
if ((ret == 0 && !invert_search) || (ret == REG_NOMATCH && invert_search)) {
/* if we found a match but were told to be quiet, stop here and /* if we found a match but were told to be quiet, stop here and
* return success */ * return success */
if (be_quiet) { if (be_quiet)
regfree(&regex); exit(0);
exit(0);
}
/* keep track of matches */ /* keep track of matches */
nmatches++; nmatches++;
/* if we're just printing filenames, we stop after the first match */ /* if we're just printing filenames, we stop after the first match */
if (print_files_with_matches) if (print_files_with_matches)
break; break;
/* print the matched line */ /* print the matched line */
if (print_match_counts == 0) { if (print_match_counts == 0) {
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1; int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
/* if we were told to print 'before' lines and there is at least /* if we were told to print 'before' lines and there is at least
* one line in the circular buffer, print them */ * one line in the circular buffer, print them */
if (lines_before && before_buf[prevpos] != NULL) { if (lines_before && before_buf[prevpos] != NULL) {
int first_buf_entry_line_num = linenum - lines_before; int first_buf_entry_line_num = linenum - lines_before;
/* advance to the first entry in the circular buffer, and /* advance to the first entry in the circular buffer, and
* figure out the line number is of the first line in the * figure out the line number is of the first line in the
* buffer */ * buffer */
idx = curpos; idx = curpos;
while (before_buf[idx] == NULL) { while (before_buf[idx] == NULL) {
idx = (idx + 1) % lines_before; idx = (idx + 1) % lines_before;
first_buf_entry_line_num++; first_buf_entry_line_num++;
}
/* now print each line in the buffer, clearing them as we go */
while (before_buf[idx] != NULL) {
print_line(before_buf[idx], first_buf_entry_line_num, '-');
free(before_buf[idx]);
before_buf[idx] = NULL;
idx = (idx + 1) % lines_before;
first_buf_entry_line_num++;
}
} }
/* now print each line in the buffer, clearing them as we go */ /* make a note that we need to print 'after' lines */
while (before_buf[idx] != NULL) { print_n_lines_after = lines_after;
print_line(before_buf[idx], first_buf_entry_line_num, '-'); #endif /* BB_FEATURE_GREP_CONTEXT */
free(before_buf[idx]); print_line(line, linenum, ':');
before_buf[idx] = NULL;
idx = (idx + 1) % lines_before;
first_buf_entry_line_num++;
}
} }
/* make a note that we need to print 'after' lines */
print_n_lines_after = lines_after;
#endif /* BB_FEATURE_GREP_CONTEXT */
print_line(line, linenum, ':');
} }
}
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
else { /* no match */ else { /* no match */
/* Add the line to the circular 'before' buffer */ /* Add the line to the circular 'before' buffer */
if(lines_before) { if(lines_before) {
if(before_buf[curpos]) if(before_buf[curpos])
free(before_buf[curpos]); free(before_buf[curpos]);
before_buf[curpos] = strdup(line); before_buf[curpos] = strdup(line);
curpos = (curpos + 1) % lines_before; curpos = (curpos + 1) % lines_before;
}
} }
}
/* if we need to print some context lines after the last match, do so */ /* if we need to print some context lines after the last match, do so */
if (print_n_lines_after && (last_line_printed != linenum)) { if (print_n_lines_after && (last_line_printed != linenum)) {
print_line(line, linenum, '-'); print_line(line, linenum, '-');
print_n_lines_after--; print_n_lines_after--;
} }
#endif /* BB_FEATURE_GREP_CONTEXT */ #endif /* BB_FEATURE_GREP_CONTEXT */
} /* for */
free(line); free(line);
} }
@ -189,23 +193,63 @@ static void grep_file(FILE *file)
matched = 1; matched = 1;
} }
static void add_regex(const char *restr)
{
regexes = xrealloc(regexes, sizeof(regex_t) * (++nregexes));
xregcomp(&regexes[nregexes-1], restr, reflags);
}
static void load_regexes_from_file(const char *filename)
{
char *line;
FILE *f = xfopen(filename, "r");
while ((line = get_line_from_file(f)) != NULL) {
chomp(line);
add_regex(line);
free(line);
}
}
#ifdef BB_FEATURE_CLEAN_UP
static void destroy_regexes()
{
if (regexes == NULL)
return;
/* destroy all the elments in the array */
while (--nregexes >= 0) {
regfree(regexes[nregexes]);
free(regexes[nregexes]);
}
}
#endif
extern int grep_main(int argc, char **argv) extern int grep_main(int argc, char **argv)
{ {
int opt; int opt;
int reflags;
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
char *junk; char *junk;
#endif #endif
#ifdef BB_FEATURE_CLEAN_UP
/* destroy command strings on exit */
if (atexit(destroy_regexes) == -1)
perror_msg_and_die("atexit");
#endif
/* do normal option parsing */ /* do normal option parsing */
while ((opt = getopt(argc, argv, "iHhlnqvsc" while ((opt = getopt(argc, argv, "iHhlnqvsce:f:"
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
"A:B:C:" "A:B:C:"
#endif #endif
)) > 0) { )) > 0) {
switch (opt) { switch (opt) {
case 'i': case 'i':
ignore_case++; reflags |= REG_ICASE;
break; break;
case 'l': case 'l':
print_files_with_matches++; print_files_with_matches++;
@ -231,6 +275,12 @@ extern int grep_main(int argc, char **argv)
case 'c': case 'c':
print_match_counts++; print_match_counts++;
break; break;
case 'e':
add_regex(optarg);
break;
case 'f':
load_regexes_from_file(optarg);
break;
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
case 'A': case 'A':
lines_after = strtoul(optarg, &junk, 10); lines_after = strtoul(optarg, &junk, 10);
@ -255,11 +305,18 @@ extern int grep_main(int argc, char **argv)
} }
} }
/* argv[optind] should be the regex pattern; no pattern, no worky */ /* if we didn't get a pattern from a -e and no command file was specified,
if (argv[optind] == NULL) * argv[optind] should be the pattern. no pattern, no worky */
show_usage(); if (nregexes == 0) {
if (argv[optind] == NULL)
show_usage();
else {
add_regex(argv[optind]);
optind++;
}
}
/* sanity check */ /* sanity checks */
if (print_match_counts || be_quiet || print_files_with_matches) { if (print_match_counts || be_quiet || print_files_with_matches) {
print_line_num = 0; print_line_num = 0;
#ifdef BB_FEATURE_GREP_CONTEXT #ifdef BB_FEATURE_GREP_CONTEXT
@ -268,28 +325,20 @@ extern int grep_main(int argc, char **argv)
#endif #endif
} }
/* compile the regular expression /* argv[(optind)..(argc-1)] should be names of file to grep through. If
* we're not going to mess with sub-expressions, and we need to
* treat newlines right. */
reflags = REG_NOSUB;
if (ignore_case)
reflags |= REG_ICASE;
xregcomp(&regex, argv[optind], reflags);
/* argv[(optind+1)..(argc-1)] should be names of file to grep through. If
* there is more than one file to grep, we will print the filenames */ * there is more than one file to grep, we will print the filenames */
if ((argc-1) - (optind+1) > 0) if ((argc-1) - (optind) > 0)
print_filename++; print_filename++;
/* If no files were specified, or '-' was specified, take input from /* If no files were specified, or '-' was specified, take input from
* stdin. Otherwise, we grep through all the files specified. */ * stdin. Otherwise, we grep through all the files specified. */
if (argv[optind+1] == NULL || (strcmp(argv[optind+1], "-") == 0)) { if (argv[optind] == NULL || (strcmp(argv[optind], "-") == 0)) {
grep_file(stdin); grep_file(stdin);
} }
else { else {
int i; int i;
FILE *file; FILE *file;
for (i = optind + 1; i < argc; i++) { for (i = optind; i < argc; i++) {
cur_file = argv[i]; cur_file = argv[i];
file = fopen(cur_file, "r"); file = fopen(cur_file, "r");
if (file == NULL) { if (file == NULL) {
@ -303,7 +352,5 @@ extern int grep_main(int argc, char **argv)
} }
} }
regfree(&regex);
return !matched; /* invert return value 0 = success, 1 = failed */ return !matched; /* invert return value 0 = success, 1 = failed */
} }

3
tests/testcases
View File

@ -150,9 +150,10 @@ free
# grep # grep
grep -l strdup ../*.c grep -l strdup ../*.c
grep -c strdup ../*.c grep -c strdup ../*.c
# I swear, GNU grep seems broken for this next one
grep -lc strdup ../*.c grep -lc strdup ../*.c
grep -cv strdup ../*.c grep -cv strdup ../*.c
grep -i null ../grep.c
grep -e strdup -e regcomp -e atexit ../grep.c
# gunzip # gunzip