Promote strings.

1 files changed, 67 insertions, 0 deletions

diff --git a/toys/posix/strings.c b/toys/posix/strings.c
new file mode 100644
index 00000000..a872cf6a
--- /dev/null
+++ b/toys/posix/strings.c
@@ -0,0 +1,67 @@
+/*strings.c - print the strings of printable characters in files.
+ *
+ * Copyright 2014 Kyung-su Kim <kaspyx@gmail.com>
+ * Copyright 2014 Kyungwan Han <asura321@gmail.com>
+ *
+ * No Standard
+ * TODO: utf8 strings
+ * TODO: posix -t
+
+USE_STRINGS(NEWTOY(strings, "an#=4<1fo", TOYFLAG_USR|TOYFLAG_BIN))
+
+config STRINGS
+  bool "strings"
+  default y
+  help
+    usage: strings [-fo] [-n LEN] [FILE...]
+
+    Display printable strings in a binary file
+
+    -f	Precede strings with filenames
+    -n	At least LEN characters form a string (default 4)
+    -o	Precede strings with decimal offsets
+*/
+
+#define FOR_strings
+#include "toys.h"
+
+GLOBALS(
+  long num;
+)
+
+void do_strings(int fd, char *filename)
+{
+  int nread, i, wlen = TT.num, count = 0;
+  off_t offset = 0;
+  char *string = xzalloc(wlen + 1);
+
+  for (;;) {
+    nread = read(fd, toybuf, sizeof(toybuf));
+    if (nread < 0) perror_msg("%s", filename);
+    if (nread < 1) break;
+    for (i = 0; i < nread; i++, offset++) {
+      if (((toybuf[i] >= 32) && (toybuf[i] <= 126)) || (toybuf[i] == '\t')) {
+        if (count == wlen) fputc(toybuf[i], stdout);
+        else {
+          string[count++] = toybuf[i];
+          if (count == wlen) {
+            if (toys.optflags & FLAG_f) printf("%s: ", filename);
+            if (toys.optflags & FLAG_o)
+              printf("%7lld ",(long long)(offset - wlen));
+            printf("%s", string);
+          }
+        }
+      } else {
+        if (count == wlen) xputc('\n');
+        count = 0;
+      }
+    }
+  }
+  xclose(fd);
+  free(string);
+}
+
+void strings_main(void)
+{
+  loopfiles(toys.optargs, do_strings);
+}