grep: add help text; fix style

2 files changed, 27 insertions, 26 deletions

diff --git a/findutils/grep.c b/findutils/grep.c
index f301b535d..e02fc8d10 100644
--- a/findutils/grep.c
+++ b/findutils/grep.c
@@ -140,7 +140,7 @@ static int grep_file(FILE *file)
                                  * match (regexec returns failure (REG_NOMATCH) and the user specified
                                  * invert search)
                                  */
-                                if(!(gl->flg_mem_alocated_compiled & COMPILED)) {
+                                if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
                                         gl->flg_mem_alocated_compiled |= COMPILED;
                                         xregcomp(&(gl->preg), gl->pattern, reflags);
                                 }
@@ -210,7 +210,7 @@ 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 (lines_before) {
                                         free(before_buf[curpos]);
                                         before_buf[curpos] = xstrdup(line);
                                         curpos = (curpos + 1) % lines_before;
@@ -273,7 +273,7 @@ static void load_regexes_from_file(llist_t *fopt)
         char *line;
         FILE *f;
 
-        while(fopt) {
+        while (fopt) {
                 llist_t *cur = fopt;
                 char *ffile = cur->data;
 
@@ -308,23 +308,23 @@ int grep_main(int argc, char **argv)
                 &pattern_head, &fopt,
                 &slines_after, &slines_before, &Copt);
 
-        if(opt & GREP_OPT_C) {
+        if (opt & GREP_OPT_C) {
                 /* C option unseted A and B options, but next -A or -B
                    may be ovewrite own option */
-                if(!(opt & GREP_OPT_A))         /* not overwtited */
+                if (!(opt & GREP_OPT_A))         /* not overwtited */
                         slines_after = Copt;
-                if(!(opt & GREP_OPT_B))         /* not overwtited */
+                if (!(opt & GREP_OPT_B))         /* not overwtited */
                         slines_before = Copt;
                 opt |= GREP_OPT_A|GREP_OPT_B;   /* set for parse now */
         }
-        if(opt & GREP_OPT_A) {
+        if (opt & GREP_OPT_A) {
                 lines_after = strtoul(slines_after, &junk, 10);
-                if(*junk != '\0')
+                if (*junk != '\0')
                         bb_error_msg_and_die(bb_msg_invalid_arg, slines_after, "-A");
         }
-        if(opt & GREP_OPT_B) {
+        if (opt & GREP_OPT_B) {
                 lines_before = strtoul(slines_before, &junk, 10);
-                if(*junk != '\0')
+                if (*junk != '\0')
                         bb_error_msg_and_die(bb_msg_invalid_arg, slines_before, "-B");
         }
         /* sanity checks after parse may be invalid numbers ;-) */
@@ -332,7 +332,7 @@ int grep_main(int argc, char **argv)
                 opt &= ~GREP_OPT_n;
                 lines_before = 0;
                 lines_after = 0;
-        } else if(lines_before > 0)
+        } else if (lines_before > 0)
                 before_buf = (char **)xzalloc(lines_before * sizeof(char *));
 #else
         /* with auto sanity checks */
@@ -342,31 +342,31 @@ int grep_main(int argc, char **argv)
 #endif
         invert_search = (opt & GREP_OPT_v) != 0;        /* 0 | 1 */
 
-        if(opt & GREP_OPT_H)
+        if (opt & GREP_OPT_H)
                 print_filename++;
-        if(opt & GREP_OPT_h)
+        if (opt & GREP_OPT_h)
                 print_filename--;
         if (pattern_head != NULL) {
                 /* convert char *argv[] to grep_list_data_t */
                 llist_t *cur;
 
-                for(cur = pattern_head; cur; cur = cur->link)
+                for (cur = pattern_head; cur; cur = cur->link)
                         cur->data = new_grep_list_data(cur->data, 0);
         }
-        if(opt & GREP_OPT_f)
+        if (opt & GREP_OPT_f)
                 load_regexes_from_file(fopt);
 
-        if(ENABLE_FEATURE_GREP_FGREP_ALIAS && bb_applet_name[0] == 'f')
+        if (ENABLE_FEATURE_GREP_FGREP_ALIAS && bb_applet_name[0] == 'f')
                 opt |= GREP_OPT_F;
 
-        if(!(opt & GREP_OPT_o))
+        if (!(opt & GREP_OPT_o))
                 reflags = REG_NOSUB;
 
-        if(ENABLE_FEATURE_GREP_EGREP_ALIAS &&
+        if (ENABLE_FEATURE_GREP_EGREP_ALIAS &&
                         (bb_applet_name[0] == 'e' || (opt & GREP_OPT_E)))
                 reflags |= REG_EXTENDED;
 
-        if(opt & GREP_OPT_i)
+        if (opt & GREP_OPT_i)
                 reflags |= REG_ICASE;
 
         argv += optind;
@@ -398,7 +398,7 @@ int grep_main(int argc, char **argv)
         matched = 0;
         while (argc--) {
                 cur_file = *argv++;
-                if(!cur_file || (*cur_file == '-' && !cur_file[1])) {
+                if (!cur_file || (*cur_file == '-' && !cur_file[1])) {
                         cur_file = "(standard input)";
                         file = stdin;
                 } else {
@@ -410,7 +410,7 @@ int grep_main(int argc, char **argv)
                         error_open_count++;
                 } else {
                         matched += grep_file(file);
-                        if(matched < 0) {
+                        if (matched < 0) {
                                 /* we found a match but were told to be quiet, stop here and
                                 * return success */
                                 break;
@@ -427,9 +427,9 @@ int grep_main(int argc, char **argv)
                                 (grep_list_data_t *)pattern_head_ptr->data;
 
                         pattern_head = pattern_head->link;
-                        if((gl->flg_mem_alocated_compiled & PATTERN_MEM_A))
+                        if ((gl->flg_mem_alocated_compiled & PATTERN_MEM_A))
                                 free(gl->pattern);
-                        if((gl->flg_mem_alocated_compiled & COMPILED))
+                        if ((gl->flg_mem_alocated_compiled & COMPILED))
                                 regfree(&(gl->preg));
                         free(pattern_head_ptr);
                 }
@@ -437,9 +437,9 @@ int grep_main(int argc, char **argv)
         /* 0 = success, 1 = failed, 2 = error */
         /* If the -q option is specified, the exit status shall be zero
          * if an input line is selected, even if an error was detected.  */
-        if(BE_QUIET && matched)
+        if (BE_QUIET && matched)
                 return 0;
-        if(error_open_count)
+        if (error_open_count)
                 return 2;
         return !matched; /* invert return value 0 = success, 1 = failed */
 }
diff --git a/include/usage.h b/include/usage.h
index bb814f1f8..543befca3 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -927,7 +927,7 @@ USE_FEATURE_DATE_ISOFMT( \
         "\t-H login_host\tLog login_host into the utmp file as the hostname"
 
 #define grep_trivial_usage \
-        "[-ihHnqvs" \
+        "[-ihHnqvso" \
         USE_FEATURE_GREP_EGREP_ALIAS("E") \
         USE_FEATURE_GREP_CONTEXT("ABC") \
         "] PATTERN [FILEs...]"
@@ -945,6 +945,7 @@ USE_FEATURE_DATE_ISOFMT( \
         "\t-s\tsuppress file open/read error messages\n" \
         "\t-c\tonly print count of matching lines\n" \
         "\t-f\tread PATTERN from file\n" \
+        "\t-o\tshow only the part of a line that matches PATTERN\n" \
         "\t-e\tPATTERN is a regular expression\n" \
         "\t-F\tPATTERN is a set of newline-separated strings" \
         USE_FEATURE_GREP_EGREP_ALIAS("\n\t-E\tPATTERN is an extended regular expression") \