From 174ba2bed2f33fe90926b08a3e9ec4e3ce7febab Mon Sep 17 00:00:00 2001
From: Strake <devnull@localhost>
Date: Tue, 23 Jul 2013 20:19:31 -0500
Subject: grep

---
 toys/pending/grep.c | 62 +++++++++++++++++++++++++++--------------------------
 1 file changed, 32 insertions(+), 30 deletions(-)

diff --git a/toys/pending/grep.c b/toys/pending/grep.c
index 52f30678..5b614829 100644
--- a/toys/pending/grep.c
+++ b/toys/pending/grep.c
@@ -5,13 +5,13 @@
  * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/
  * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/cmdbehav.html
 
-USE_GREP(NEWTOY(grep, "EFhinovclqe*f*m#", TOYFLAG_BIN))
+USE_GREP(NEWTOY(grep, "EFHahinosvclqe*f*m#", TOYFLAG_BIN))
 
 config GREP
   bool "grep"
   default n
   help
-    usage: grep [-clq] [-EFhinov] (-e RE | -f REfile | RE) [file...]
+    usage: grep [-clq] [-EFHhinosv] (-e RE | -f REfile | RE) [file...]
 
     modes:
       default: print lines from each file what match regular expression RE.
@@ -22,27 +22,25 @@ config GREP
     flags:
       -E:   extended RE syntax
       -F:   fixed RE syntax, i.e. all characters literal
+      -H:   print file name
       -h:   not print file name
       -i:   case insensitive
       -n:   print line numbers
       -o:   print only matching part
+      -s:   keep silent on error
       -v:   invert match
 */
 
 #define FOR_grep
 #include "toys.h"
 #include <regex.h>
-#include <err.h>
-
-/* could be in GLOBALS but so need initialization code */
-static int c = 1;
 
 static regex_t re; /* fails in GLOBALS */
 
 GLOBALS(
   long mArgu;
   struct arg_list *fArgu, *eArgu;
-  char mode;
+  char mode, *re_xs;
 )
 
 static void do_grep (int fd, char *name) {
@@ -60,10 +58,11 @@ static void do_grep (int fd, char *name) {
 
     while (regexec (&re, y, 1, &match, atBOL ? 0 : REG_NOTBOL) == 0) {
       if (atBOL) nMatch++;
-      c = 0; atBOL = 0;
+      toys.exitval = 0;
+      atBOL = 0;
       switch (TT.mode) {
       case 'q':
-        exit (0);
+        xexit ();
       case 'l':
         if (!(toys.optflags & FLAG_h)) printf ("%s\n", name);
         free (x);
@@ -102,15 +101,15 @@ char *regfix (char *re_xs) {
   return re_ys;
 }
 
-void buildRE (void) {
-  char *re_xs;
+void addRE (char *x) {
+  if (toys.optflags & FLAG_F) x = regfix (x);
+  if (TT.re_xs) TT.re_xs = astrcat (TT.re_xs, "|");
+  TT.re_xs = astrcat (TT.re_xs, x);
+  if (toys.optflags & FLAG_F) free (x);
+}
 
-  re_xs = 0;
-  for (; TT.eArgu; TT.eArgu = TT.eArgu -> next) {
-    if (toys.optflags & FLAG_F) TT.eArgu -> arg = regfix (TT.eArgu -> arg);
-    if (re_xs) re_xs = xastrcat (re_xs, "|");
-    re_xs = xastrcat (re_xs, TT.eArgu -> arg);
-  }
+void buildRE (void) {
+  for (; TT.eArgu; TT.eArgu = TT.eArgu -> next) addRE (TT.eArgu -> arg);
   for (; TT.fArgu; TT.fArgu = TT.fArgu -> next) {
     FILE *f;
     char *x, *y;
@@ -121,30 +120,32 @@ void buildRE (void) {
     for (;;) {
       if (getline (&x, &l, f) < 0) {
         if (feof (f)) break;
-        err (2, "failed to read");
+        toys.exitval = 2;
+        perror_exit ("failed to read");
       }
       y = x + strlen (x) - 1;
       if (y[0] == '\n') y[0] = 0;
 
-      y = toys.optflags & FLAG_F ? regfix (x) : x;
-      if (re_xs) re_xs = xastrcat (re_xs, "|");
-      re_xs = xastrcat (re_xs, y);
-      free (y);
+      addRE (x);
     }
     free (x);
     fclose (f);
   }
 
-  if (!re_xs) {
-    if (toys.optc < 1) errx (2, "no RE");
-    re_xs = toys.optflags & FLAG_F ? regfix (toys.optargs[0]) : toys.optargs[0];
+  if (!TT.re_xs) {
+    if (toys.optc < 1) {
+      toys.exitval = 2;
+      error_exit ("no RE");
+    }
+    TT.re_xs = toys.optflags & FLAG_F ? regfix (toys.optargs[0]) : toys.optargs[0];
     toys.optc--; toys.optargs++;
   }
 
-  if (regcomp (&re, re_xs,
+  if (regcomp (&re, TT.re_xs,
                (toys.optflags & (FLAG_E | FLAG_F) ? REG_EXTENDED : 0) |
                (toys.optflags &  FLAG_i           ? REG_ICASE    : 0)) != 0) {
-    errx (2, "bad RE");
+    toys.exitval = 2;
+    error_exit ("bad RE");
   }
 }
 
@@ -155,8 +156,9 @@ void grep_main (void) {
   if (toys.optflags & FLAG_l) TT.mode = 'l';
   if (toys.optflags & FLAG_q) TT.mode = 'q';
 
-  if (toys.optc > 0) loopfiles (toys.optargs, do_grep);
-  else do_grep (0, "-");
+  if (!(toys.optflags & FLAG_H) && (toys.optc < 2)) toys.optflags |= FLAG_h;
 
-  exit (c);
+  toys.exitval = 1;
+  loopfiles_rw (toys.optargs, O_RDONLY, 0, toys.optflags & FLAG_s, do_grep);
+  xexit ();
 }
-- 
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