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authorGravatar David Bremner <bremner@debian.org>2012-11-24 09:43:42 -0400
committerGravatar David Bremner <bremner@debian.org>2012-12-08 10:56:11 -0400
commit9ff72a83bda69e6c064bd8be9f201a4626bff54e (patch)
treea53eea64b65ebd90f80f4f2b4868cf4bb04c899b
parent10085656d5db8e9d26f83ad0b62f9428bb5425c0 (diff)
util: add string-util.[ch]
This is to give a home to strtok_len. It's a bit silly to add a header for one routine, but it needs to be shared between several compilation units (or at least that's the most natural design).
-rw-r--r--util/Makefile.local3
-rw-r--r--util/string-util.c34
-rw-r--r--util/string-util.h22
3 files changed, 58 insertions, 1 deletions
diff --git a/util/Makefile.local b/util/Makefile.local
index 3ca623ec..a11e35b9 100644
--- a/util/Makefile.local
+++ b/util/Makefile.local
@@ -3,7 +3,8 @@
dir := util
extra_cflags += -I$(srcdir)/$(dir)
-libutil_c_srcs := $(dir)/xutil.c $(dir)/error_util.c $(dir)/hex-escape.c
+libutil_c_srcs := $(dir)/xutil.c $(dir)/error_util.c $(dir)/hex-escape.c \
+ $(dir)/string-util.c
libutil_modules := $(libutil_c_srcs:.c=.o)
diff --git a/util/string-util.c b/util/string-util.c
new file mode 100644
index 00000000..44f8cd3a
--- /dev/null
+++ b/util/string-util.c
@@ -0,0 +1,34 @@
+/* string-util.c - Extra or enhanced routines for null terminated strings.
+ *
+ * Copyright (c) 2012 Jani Nikula
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/ .
+ *
+ * Author: Jani Nikula <jani@nikula.org>
+ */
+
+
+#include "string-util.h"
+
+char *
+strtok_len (char *s, const char *delim, size_t *len)
+{
+ /* skip initial delims */
+ s += strspn (s, delim);
+
+ /* length of token */
+ *len = strcspn (s, delim);
+
+ return *len ? s : NULL;
+}
diff --git a/util/string-util.h b/util/string-util.h
new file mode 100644
index 00000000..ac7676c8
--- /dev/null
+++ b/util/string-util.h
@@ -0,0 +1,22 @@
+#ifndef _STRING_UTIL_H
+#define _STRING_UTIL_H
+
+#include <string.h>
+
+/* like strtok(3), but without state, and doesn't modify s. Return
+ * value is indicated by pointer and length, not null terminator.
+ *
+ * Usage pattern:
+ *
+ * const char *tok = input;
+ * const char *delim = " \t";
+ * size_t tok_len = 0;
+ *
+ * while ((tok = strtok_len (tok + tok_len, delim, &tok_len)) != NULL) {
+ * // do stuff with string tok of length tok_len
+ * }
+ */
+
+char *strtok_len (char *s, const char *delim, size_t *len);
+
+#endif