Move grep from pending to posix, switch default to y.

1 files changed, 286 insertions, 0 deletions

diff --git a/toys/posix/grep.c b/toys/posix/grep.c
new file mode 100644
index 00000000..7a2ca3a3
--- /dev/null
+++ b/toys/posix/grep.c
@@ -0,0 +1,286 @@
+/* grep.c - print lines what match given regular expression
+ *
+ * Copyright 2013 CE Strake <strake888 at gmail.com>
+ *
+ * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/grep.html
+
+USE_GREP(NEWTOY(grep, "EFHabhinorsvwclqe*f*m#x[!wx][!EFw]", TOYFLAG_BIN))
+USE_GREP(OLDTOY(egrep, grep, OPTSTR_grep, TOYFLAG_BIN))
+USE_GREP(OLDTOY(fgrep, grep, OPTSTR_grep, TOYFLAG_BIN))
+
+config GREP
+  bool "grep"
+  default y
+  help
+    usage: grep [-EFivwcloqsHbhn] [-m MAX] [-e REGEX]... [-f REGFILE] [FILE]...
+
+    Show lines matching regular expressions. If no -e, first argument is
+    regular expression to match. With no files (or "-" filename) read stdin.
+    Returns 0 if matched, 1 if no match found.
+
+    -e  Regex to match. (May be repeated.)
+    -f  File containing regular expressions to match.
+
+    match type:
+    -E  extended regex syntax    -F  fixed (match literal string)
+    -i  case insensitive         -m  stop after this many lines matched
+    -r  recursive (on dir)       -v  invert match
+    -w  whole word (implies -E)  -x  whole line
+
+    display modes: (default: matched line)
+    -c  count of matching lines  -l  show matching filenames
+    -o  only matching part       -q  quiet (errors only)
+    -s  silent (no error msg)    
+
+    prefix modes (default: filename if checking more than 1 file)
+    -H  force filename           -b  byte offset of match
+    -h  hide filename            -n  line number of match
+*/
+
+#define FOR_grep
+#include "toys.h"
+#include <regex.h>
+
+GLOBALS(
+  long m;
+  struct arg_list *f;
+  struct arg_list *e;
+
+  struct arg_list *regex;
+)
+
+static void do_grep(int fd, char *name)
+{
+  FILE *file = fdopen(fd, "r");
+  long offset = 0;
+  int lcount = 0, mcount = 0, which = toys.optflags & FLAG_w ? 2 : 0;
+
+  if (!fd) name = "(standard input)";
+
+  if (!file) {
+    perror_msg("%s", name);
+    return;
+  }
+
+  for (;;) {
+    char *line = 0, *start;
+    regmatch_t matches[3];
+    size_t unused;
+    long len;
+    int mmatch = 0;
+
+    lcount++;
+    if (0 > (len = getline(&line, &unused, file))) break;
+    if (line[len-1] == '\n') line[len-1] = 0;
+
+    start = line;
+
+    for (;;)
+    {
+      int rc = 0, skip = 0;
+
+      if (toys.optflags & FLAG_F) {
+        struct arg_list *seek, fseek;
+        char *s = 0;
+
+        for (seek = TT.e; seek; seek = seek->next) {
+          if (!*seek->arg) {
+            seek = &fseek;
+            fseek.arg = s = line;
+            break;
+          }
+          if (toys.optflags & FLAG_i) {
+            long ll = strlen(seek->arg);;
+
+            // Alas, posix hasn't got strcasestr()
+            for (s = line; *s; s++) if (!strncasecmp(s, seek->arg, ll)) break;
+            if (!*s) s = 0;
+          } else s = strstr(line, seek->arg);
+          if (s) break;
+        }
+
+        if (s) {
+          matches[which].rm_so = (s-line);
+          skip = matches[which].rm_eo = (s-line)+strlen(seek->arg);
+        } else rc = 1;
+      } else {
+        rc = regexec((regex_t *)toybuf, start, 3, matches,
+                     start==line ? 0 : REG_NOTBOL);
+        skip = matches[which].rm_eo;
+      }
+
+      if (toys.optflags & FLAG_x)
+        if (matches[which].rm_so || line[matches[which].rm_eo]) rc = 1;
+
+      if (toys.optflags & FLAG_v) {
+        if (toys.optflags & FLAG_o) {
+          if (rc) skip = matches[which].rm_eo = strlen(start);
+          else if (!matches[which].rm_so) {
+            start += skip;
+            continue;
+          } else matches[which].rm_eo = matches[which].rm_so;
+        } else {
+          if (!rc) break;
+          matches[which].rm_eo = strlen(start);
+        }
+        matches[which].rm_so = 0;
+      } else if (rc) break;
+
+      mmatch++;
+      if (toys.optflags & FLAG_q) {
+        toys.exitval = 0;
+        xexit();
+      }
+      if (toys.optflags & FLAG_l) {
+        printf("%s\n", name);
+        free(line);
+        fclose(file);
+        return;
+      }
+      if (toys.optflags & FLAG_o)
+        if (matches[which].rm_eo == matches[which].rm_so)
+          break;
+
+      if (!(toys.optflags & FLAG_c)) {
+        if (toys.optflags & FLAG_H) printf("%s:", name);
+        if (toys.optflags & FLAG_n) printf("%d:", lcount);
+        if (toys.optflags & FLAG_b)
+          printf("%ld:", offset + (start-line) +
+              ((toys.optflags & FLAG_o) ? matches[which].rm_so : 0));
+        if (!(toys.optflags & FLAG_o)) xputs(line);
+        else {
+          xprintf("%.*s\n", matches[which].rm_eo - matches[which].rm_so,
+                  start + matches[which].rm_so);
+        }
+      }
+
+      start += skip;
+      if (!(toys.optflags & FLAG_o) || !*start) break;
+    }
+    offset += len;
+
+    free(line);
+
+    if (mmatch) mcount++;
+    if ((toys.optflags & FLAG_m) && mcount >= TT.m) break;
+  }
+
+  if (toys.optflags & FLAG_c) {
+    if (toys.optflags & FLAG_H) printf("%s:", name);
+    xprintf("%d\n", mcount);
+  }
+
+  // loopfiles will also close the fd, but this frees an (opaque) struct.
+  fclose(file);
+}
+
+static void parse_regex(void)
+{
+  struct arg_list *al, *new, *list = NULL;
+  long len = 0;
+  char *s, *ss;
+
+  // Add all -f lines to -e list. (Yes, this is leaking allocation context for
+  // exit to free. Not supporting nofork for this command any time soon.)
+  al = TT.f ? TT.f : TT.e;
+  while (al) {
+    if (TT.f) s = ss = xreadfile(al->arg);
+    else s = ss = al->arg;
+
+    do {
+      ss = strchr(s, '\n');
+      if (ss) *(ss++) = 0;
+      new = xmalloc(sizeof(struct arg_list));
+      new->next = list;
+      new->arg = s;
+      list = new;
+      s = ss;
+    } while (ss && *s);
+    al = al->next;
+    if (!al && TT.f) {
+      TT.f = 0;
+      al = TT.e;
+    }
+  }
+  TT.e = list;
+
+  if (!(toys.optflags & FLAG_F)) {
+    int w = toys.optflags & FLAG_w;
+    char *regstr;
+
+    // Convert strings to one big regex
+    if (w) len = 36;
+    for (al = TT.e; al; al = al->next) len += strlen(al->arg)+1;
+
+    regstr = s = xmalloc(len);
+    if (w) s = stpcpy(s, "(^|[^_[:alnum:]])(");
+    for (al = TT.e; al; al = al->next) {
+      s = stpcpy(s, al->arg);
+      if (!(toys.optflags & FLAG_E)) *(s++) = '\\';
+      *(s++) = '|';
+    }
+    *(s-=(1+!(toys.optflags & FLAG_E))) = 0;
+    if (w) strcpy(s, ")($|[^_[:alnum:]])");
+
+    w = regcomp((regex_t *)toybuf, regstr,
+                ((toys.optflags & FLAG_E) ? REG_EXTENDED : 0) |
+                ((toys.optflags & FLAG_i) ? REG_ICASE    : 0));
+
+    if (w) {
+      regerror(w, (regex_t *)toybuf, toybuf+sizeof(regex_t),
+               sizeof(toybuf)-sizeof(regex_t));
+      error_exit("bad REGEX: %s", toybuf);
+    }
+  }
+}
+
+static int do_grep_r(struct dirtree *new)
+{
+  char *name;
+
+  if (new->parent && !dirtree_notdotdot(new)) return 0;
+  if (S_ISDIR(new->st.st_mode)) return DIRTREE_RECURSE;
+
+  // "grep -r onefile" doesn't show filenames, but "grep -r onedir" should.
+  if (new->parent && !(toys.optflags & FLAG_h)) toys.optflags |= FLAG_H;
+
+  name = dirtree_path(new, 0);
+  do_grep(openat(dirtree_parentfd(new), new->name, 0), name);
+  free(name);
+
+  return 0;
+}
+
+void grep_main(void)
+{
+  char **ss;
+
+  // Handle egrep and fgrep
+  if (*toys.which->name == 'e' || (toys.optflags & FLAG_w))
+    toys.optflags |= FLAG_E;
+  if (*toys.which->name == 'f') toys.optflags |= FLAG_F;
+
+  if (!TT.e && !TT.f) {
+    if (!*toys.optargs) error_exit("no REGEX");
+    TT.e = xzalloc(sizeof(struct arg_list));
+    TT.e->arg = *(toys.optargs++);
+    toys.optc--;
+  }
+
+  parse_regex();
+
+  if (!(toys.optflags & FLAG_h) && toys.optc>1) toys.optflags |= FLAG_H;
+
+  toys.exitval = 1;
+  if (toys.optflags & FLAG_s) {
+    close(2);
+    xopen("/dev/null", O_RDWR);
+  }
+
+  if (toys.optflags & FLAG_r) {
+    for (ss=toys.optargs; *ss; ss++) {
+      if (!strcmp(*ss, "-")) do_grep(0, *ss);
+      else dirtree_read(*ss, do_grep_r);
+    }
+  } else loopfiles_rw(toys.optargs, O_RDONLY, 0, 1, do_grep);
+}