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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-08-09 16:15:14 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-08-09 16:15:14 +0000
commit3fd15e197e21aa313ce56126ee814f0ebc884dee (patch)
tree38ac32cdea89bff09017eda0a1836e60f2c06749 /findutils
parentfb5902ca5cf802557eb1e3c56502a2f5e27242f4 (diff)
downloadbusybox-3fd15e197e21aa313ce56126ee814f0ebc884dee.tar.gz
busybox-3fd15e197e21aa313ce56126ee814f0ebc884dee.tar.bz2
grep: option to use GNU regex matching instead of POSIX one.
This fixes problems with NULs in files being scanned, but costs +800 bytes. The same can be done to sed (TODO).
Diffstat (limited to 'findutils')
-rw-r--r--findutils/grep.c129
1 files changed, 101 insertions, 28 deletions
diff --git a/findutils/grep.c b/findutils/grep.c
index 030e62461..f2ed01e74 100644
--- a/findutils/grep.c
+++ b/findutils/grep.c
@@ -96,6 +96,7 @@ struct globals {
int lines_before;
int lines_after;
char **before_buf;
+ USE_EXTRA_COMPAT(size_t *before_buf_size;)
int last_line_printed;
#endif
/* globals used internally */
@@ -117,6 +118,7 @@ struct globals {
#define lines_before (G.lines_before )
#define lines_after (G.lines_after )
#define before_buf (G.before_buf )
+#define before_buf_size (G.before_buf_size )
#define last_line_printed (G.last_line_printed )
#define pattern_head (G.pattern_head )
#define cur_file (G.cur_file )
@@ -124,14 +126,24 @@ struct globals {
typedef struct grep_list_data_t {
char *pattern;
- regex_t preg;
+/* for GNU regex, matched_range must be persistent across grep_file() calls */
+#if !ENABLE_EXTRA_COMPAT
+ regex_t compiled_regex;
+ regmatch_t matched_range;
+#else
+ struct re_pattern_buffer compiled_regex;
+ struct re_registers matched_range;
+#endif
#define ALLOCATED 1
#define COMPILED 2
int flg_mem_alocated_compiled;
} grep_list_data_t;
-
-static void print_line(const char *line, int linenum, char decoration)
+#if !ENABLE_EXTRA_COMPAT
+#define print_line(line, line_len, linenum, decoration) \
+ print_line(line, linenum, decoration)
+#endif
+static void print_line(const char *line, size_t line_len, int linenum, char decoration)
{
#if ENABLE_FEATURE_GREP_CONTEXT
/* Happens when we go to next file, immediately hit match
@@ -139,8 +151,9 @@ static void print_line(const char *line, int linenum, char decoration)
if (linenum < 1)
return;
/* possibly print the little '--' separator */
- if ((lines_before || lines_after) && did_print_line &&
- last_line_printed != linenum - 1) {
+ if ((lines_before || lines_after) && did_print_line
+ && last_line_printed != linenum - 1
+ ) {
puts("--");
}
/* guard against printing "--" before first line of first file */
@@ -152,17 +165,50 @@ static void print_line(const char *line, int linenum, char decoration)
if (PRINT_LINE_NUM)
printf("%i%c", linenum, decoration);
/* Emulate weird GNU grep behavior with -ov */
- if ((option_mask32 & (OPT_v|OPT_o)) != (OPT_v|OPT_o))
+ if ((option_mask32 & (OPT_v|OPT_o)) != (OPT_v|OPT_o)) {
+#if !ENABLE_EXTRA_COMPAT
puts(line);
+#else
+ fwrite(line, 1, line_len, stdout);
+ putchar('\n');
+#endif
+ }
}
-static int grep_file(FILE *file)
+#if ENABLE_EXTRA_COMPAT
+/* Unlike getline, this one removes trailing '\n' */
+static ssize_t FAST_FUNC bb_getline(char **line_ptr, size_t *line_alloc_len, FILE *file)
{
+ ssize_t res_sz;
char *line;
+
+ res_sz = getline(line_ptr, line_alloc_len, file);
+ line = *line_ptr;
+
+ if (res_sz > 0) {
+ if (line[res_sz - 1] == '\n')
+ line[--res_sz] = '\0';
+ } else {
+ free(line); /* uclibc allocates a buffer even on EOF. WTF? */
+ }
+ return res_sz;
+}
+#endif
+
+static int grep_file(FILE *file)
+{
smalluint found;
int linenum = 0;
int nmatches = 0;
- regmatch_t regmatch;
+#if !ENABLE_EXTRA_COMPAT
+ char *line;
+#else
+ char *line = NULL;
+ ssize_t line_len;
+ size_t line_alloc_len;
+#define rm_so start[0]
+#define rm_eo end[0]
+#endif
#if ENABLE_FEATURE_GREP_CONTEXT
int print_n_lines_after = 0;
int curpos = 0; /* track where we are in the circular 'before' buffer */
@@ -171,7 +217,13 @@ static int grep_file(FILE *file)
enum { print_n_lines_after = 0 };
#endif /* ENABLE_FEATURE_GREP_CONTEXT */
- while ((line = xmalloc_fgetline(file)) != NULL) {
+ while (
+#if !ENABLE_EXTRA_COMPAT
+ (line = xmalloc_fgetline(file)) != NULL
+#else
+ (line_len = bb_getline(&line, &line_alloc_len, file)) >= 0
+#endif
+ ) {
llist_t *pattern_ptr = pattern_head;
grep_list_data_t *gl = gl; /* for gcc */
@@ -184,19 +236,35 @@ static int grep_file(FILE *file)
} else {
if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
gl->flg_mem_alocated_compiled |= COMPILED;
- xregcomp(&(gl->preg), gl->pattern, reflags);
+#if !ENABLE_EXTRA_COMPAT
+ xregcomp(&gl->compiled_regex, gl->pattern, reflags);
+#else
+ memset(&gl->compiled_regex, 0, sizeof(gl->compiled_regex));
+ if (re_compile_pattern(gl->pattern, strlen(gl->pattern), &gl->compiled_regex))
+ bb_error_msg_and_die("bad regex '%s'", gl->pattern);
+#endif
}
- regmatch.rm_so = 0;
- regmatch.rm_eo = 0;
- if (regexec(&(gl->preg), line, 1, &regmatch, 0) == 0) {
+#if !ENABLE_EXTRA_COMPAT
+ gl->matched_range.rm_so = 0;
+ gl->matched_range.rm_eo = 0;
+#endif
+ if (
+#if !ENABLE_EXTRA_COMPAT
+ regexec(&gl->compiled_regex, line, 1, &gl->matched_range, 0) == 0
+#else
+ re_search(&gl->compiled_regex, line, line_len,
+ /*start:*/ 0, /*range:*/ line_len,
+ &gl->matched_range) >= 0
+#endif
+ ) {
if (!(option_mask32 & OPT_w))
found = 1;
else {
char c = ' ';
- if (regmatch.rm_so)
- c = line[regmatch.rm_so - 1];
+ if (gl->matched_range.rm_so)
+ c = line[gl->matched_range.rm_so - 1];
if (!isalnum(c) && c != '_') {
- c = line[regmatch.rm_eo];
+ c = line[gl->matched_range.rm_eo];
if (!c || (!isalnum(c) && c != '_'))
found = 1;
}
@@ -261,7 +329,7 @@ static int grep_file(FILE *file)
/* 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, '-');
+ print_line(before_buf[idx], before_buf_size[idx], first_buf_entry_line_num, '-');
free(before_buf[idx]);
before_buf[idx] = NULL;
idx = (idx + 1) % lines_before;
@@ -277,13 +345,15 @@ static int grep_file(FILE *file)
/* -Fo just prints the pattern
* (unless -v: -Fov doesnt print anything at all) */
if (found)
- print_line(gl->pattern, linenum, ':');
+ print_line(gl->pattern, strlen(gl->pattern), linenum, ':');
} else {
- line[regmatch.rm_eo] = '\0';
- print_line(line + regmatch.rm_so, linenum, ':');
+ line[gl->matched_range.rm_eo] = '\0';
+ print_line(line + gl->matched_range.rm_so,
+ gl->matched_range.rm_eo - gl->matched_range.rm_so,
+ linenum, ':');
}
} else {
- print_line(line, linenum, ':');
+ print_line(line, line_len, linenum, ':');
}
}
}
@@ -291,12 +361,13 @@ static int grep_file(FILE *file)
else { /* no match */
/* if we need to print some context lines after the last match, do so */
if (print_n_lines_after) {
- print_line(line, linenum, '-');
+ print_line(line, strlen(line), linenum, '-');
print_n_lines_after--;
} else if (lines_before) {
/* Add the line to the circular 'before' buffer */
free(before_buf[curpos]);
before_buf[curpos] = line;
+ USE_EXTRA_COMPAT(before_buf_size[curpos] = line_len;)
curpos = (curpos + 1) % lines_before;
/* avoid free(line) - we took the line */
line = NULL;
@@ -304,13 +375,14 @@ static int grep_file(FILE *file)
}
#endif /* ENABLE_FEATURE_GREP_CONTEXT */
+#if !ENABLE_EXTRA_COMPAT
free(line);
-
+#endif
/* Did we print all context after last requested match? */
if ((option_mask32 & OPT_m)
&& !print_n_lines_after && nmatches == max_matches)
break;
- }
+ } /* while (read line) */
/* special-case file post-processing for options where we don't print line
* matches, just filenames and possibly match counts */
@@ -428,15 +500,16 @@ int grep_main(int argc, char **argv)
lines_after = Copt;
if (!(option_mask32 & OPT_B)) /* not overridden */
lines_before = Copt;
- //option_mask32 |= OPT_A|OPT_B; /* for parser */
}
/* sanity checks */
if (option_mask32 & (OPT_c|OPT_q|OPT_l|OPT_L)) {
option_mask32 &= ~OPT_n;
lines_before = 0;
lines_after = 0;
- } else if (lines_before > 0)
- before_buf = xzalloc(lines_before * sizeof(char *));
+ } else if (lines_before > 0) {
+ before_buf = xzalloc(lines_before * sizeof(before_buf[0]));
+ USE_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));)
+ }
#else
/* with auto sanity checks */
/* -H unsets -h; -c,-q or -l unset -n; -e,-f are lists; -m N */
@@ -537,7 +610,7 @@ int grep_main(int argc, char **argv)
if (gl->flg_mem_alocated_compiled & ALLOCATED)
free(gl->pattern);
if (gl->flg_mem_alocated_compiled & COMPILED)
- regfree(&(gl->preg));
+ regfree(&gl->compiled_regex);
free(gl);
free(pattern_head_ptr);
}