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grep: fix buglets with context printing

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print_line                                           152     170     +18
did_print_line                                         -       1      +1
grep_file                                            788     771     -17
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(add/remove: 1/0 grow/shrink: 1/1 up/down: 19/-17)              Total: 2 bytes
   text    data     bss     dec     hex filename
 673368    2740   13968  690076   a879c busybox_old
 673368    2740   13968  690076   a879c busybox_unstripped
This commit is contained in:
Denis Vlasenko 2007-07-15 12:38:18 +00:00
parent bdc406d15d
commit 8d5aa870a6
1 changed files with 42 additions and 28 deletions
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70
findutils/grep.c
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@ -91,6 +91,7 @@ static byte_t print_filename;
static byte_t open_errors;
#if ENABLE_FEATURE_GREP_CONTEXT
static byte_t did_print_line;
static int lines_before;
static int lines_after;
static char **before_buf;
@ -112,11 +113,17 @@ typedef struct grep_list_data_t {
static void print_line(const char *line, int linenum, char decoration)
{
#if ENABLE_FEATURE_GREP_CONTEXT
/* Happens when we go to next file, immediately hit match
* and try to print prev context... from prev file! Don't do it */
if (linenum < 1)
return;
/* possibly print the little '--' separator */
if ((lines_before || lines_after) && last_line_printed &&
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 */
did_print_line = 1;
last_line_printed = linenum;
#endif
if (print_filename)
@ -124,7 +131,7 @@ 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))
puts(line);
}
@ -183,19 +190,27 @@ static int grep_file(FILE *file)
} /* while (pattern_ptr) */
if (ret ^ invert_search) {
if (PRINT_FILES_WITH_MATCHES || BE_QUIET)
free(line);
/* if we found a match but were told to be quiet, stop here */
if (BE_QUIET || PRINT_FILES_WITHOUT_MATCHES)
return -1;
/* keep track of matches */
nmatches++;
/* if we're just printing filenames, we stop after the first match */
if (PRINT_FILES_WITH_MATCHES)
break;
/* quiet/print (non)matching file names only? */
if (option_mask32 & (OPT_q|OPT_l|OPT_L)) {
free(line); /* we don't need line anymore */
if (BE_QUIET) {
/* manpage says about -q:
* "exit immediately with zero status
* if any match is found,
* even if errors were detected" */
exit(0);
}
/* if we're just printing filenames, we stop after the first match */
if (PRINT_FILES_WITH_MATCHES) {
puts(cur_file);
/* fall thru to "return 1" */
}
/* OPT_L aka PRINT_FILES_WITHOUT_MATCHES: return early */
return 1; /* one match */
}
/* print the matched line */
if (PRINT_MATCH_COUNTS == 0) {
@ -239,19 +254,20 @@ static int grep_file(FILE *file)
}
#if ENABLE_FEATURE_GREP_CONTEXT
else { /* no match */
/* Add the line to the circular 'before' buffer */
if (lines_before) {
/* if we need to print some context lines after the last match, do so */
if (print_n_lines_after /* && (last_line_printed != linenum) */ ) {
print_line(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] = xstrdup(line);
before_buf[curpos] = line;
curpos = (curpos + 1) % lines_before;
/* avoid free(line) - we took line */
continue;
}
}
/* if we need to print some context lines after the last match, do so */
if (print_n_lines_after && (last_line_printed != linenum)) {
print_line(line, linenum, '-');
print_n_lines_after--;
}
#endif /* ENABLE_FEATURE_GREP_CONTEXT */
free(line);
}
@ -266,13 +282,11 @@ static int grep_file(FILE *file)
printf("%d\n", nmatches);
}
/* grep -l: print just the filename, but only if we grepped the line in the file */
if (PRINT_FILES_WITH_MATCHES && nmatches > 0) {
puts(cur_file);
}
/* grep -L: print just the filename, but only if we didn't grep the line in the file */
if (PRINT_FILES_WITHOUT_MATCHES && nmatches == 0) {
/* grep -L: print just the filename */
if (PRINT_FILES_WITHOUT_MATCHES) {
/* nmatches is zero, no need to check it:
* we return 1 early if we detected a match
* and PRINT_FILES_WITHOUT_MATCHES is set */
puts(cur_file);
}