lib: add string utilities

I see lots of the same code being copy-pasted and slightly tweaked for
string processing all over the codebase. Time to start aggregating these
pieces into something consistent and correct.

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>

1 files changed, 141 insertions, 0 deletions

diff --git a/lib/frrstr.c b/lib/frrstr.c
new file mode 100644
index 0000000000..3c38270a1d
--- /dev/null
+++ b/lib/frrstr.c
@@ -0,0 +1,141 @@
+/*
+ * FRR string processing utilities.
+ * Copyright (C) 2018  Cumulus Networks, Inc.
+ *                     Quentin Young
+ *
+ * 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 2 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; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <string.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <regex.h>
+
+#include "frrstr.h"
+#include "memory.h"
+#include "vector.h"
+
+void frrstr_split(const char *string, const char *delimiter, char ***result,
+		  int *argc)
+{
+	if (!string)
+		return;
+
+	unsigned int sz = 4, idx = 0;
+	char *copy, *copystart;
+	*result = XCALLOC(MTYPE_TMP, sizeof(char *) * sz);
+	copystart = copy = XSTRDUP(MTYPE_TMP, string);
+	*argc = 0;
+
+	const char *tok = NULL;
+	while (copy) {
+		tok = strsep(&copy, delimiter);
+		(*result)[idx] = XSTRDUP(MTYPE_TMP, tok);
+		if (++idx == sz)
+			*result = XREALLOC(MTYPE_TMP, *result,
+					   (sz *= 2) * sizeof(char *));
+		(*argc)++;
+	}
+
+	XFREE(MTYPE_TMP, copystart);
+
+	return;
+}
+
+vector frrstr_split_vec(const char *string, const char *delimiter)
+{
+	char **result;
+	int argc;
+
+	frrstr_split(string, delimiter, &result, &argc);
+
+	vector v = array_to_vector((void **)result, argc);
+	XFREE(MTYPE_TMP, result);
+	return v;
+}
+
+char *frrstr_join(const char **parts, int argc, const char *join)
+{
+	int i;
+	char *str;
+	char *p;
+	size_t len = 0;
+	size_t joinlen = join ? strlen(join) : 0;
+
+	for (i = 0; i < argc; i++)
+		len += strlen(parts[i]);
+	len += argc * joinlen + 1;
+
+	if (!len)
+		return NULL;
+
+	p = str = XMALLOC(MTYPE_TMP, len);
+
+	for (i = 0; i < argc; i++) {
+		size_t arglen = strlen(parts[i]);
+		memcpy(p, parts[i], arglen);
+		p += arglen;
+		if (i + 1 != argc) {
+			memcpy(p, join, joinlen);
+			p += joinlen;
+		}
+	}
+
+	*p = '\0';
+
+	return str;
+}
+
+char *frrstr_join_vec(vector v, const char *join)
+{
+	char **argv;
+	int argc;
+
+	vector_to_array(v, (void ***)&argv, &argc);
+
+	char *ret = frrstr_join((const char **)argv, argc, join);
+
+	XFREE(MTYPE_TMP, argv);
+
+	return ret;
+}
+
+void frrstr_filter_vec(vector v, regex_t *filter)
+{
+	regmatch_t ignored[1];
+	for (unsigned int i = 0; i < vector_active(v); i++) {
+		if (regexec(filter, vector_slot(v, i), 0, ignored, 0)) {
+			XFREE(MTYPE_TMP, vector_slot(v, i));
+			vector_unset(v, i);
+		}
+	}
+}
+
+void frrstr_strvec_free(vector v)
+{
+	unsigned int i;
+	char *cp;
+
+	if (!v)
+		return;
+
+	for (i = 0; i < vector_active(v); i++) {
+		cp = vector_slot(v, i);
+		XFREE(MTYPE_TMP, cp);
+	}
+
+	vector_free(v);
+}
+