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-rw-r--r--lib/frrstr.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/lib/frrstr.c b/lib/frrstr.c
index e5440c5..1e743d4 100644
--- a/lib/frrstr.c
+++ b/lib/frrstr.c
@@ -3,6 +3,7 @@
* FRR string processing utilities.
* Copyright (C) 2018 Cumulus Networks, Inc.
* Quentin Young
+ * Copyright (c) 2023, LabN Consulting, L.L.C.
*/
#include "zebra.h"
@@ -225,3 +226,47 @@ char *frrstr_hex(char *buff, size_t bufsiz, const uint8_t *str, size_t num)
return buff;
}
+
+const char *frrstr_skip_over_char(const char *s, int skipc)
+{
+ int c, quote = 0;
+
+ while ((c = *s++)) {
+ if (c == '\\') {
+ if (!*s++)
+ return NULL;
+ continue;
+ }
+ if (quote) {
+ if (c == quote)
+ quote = 0;
+ continue;
+ }
+ if (c == skipc)
+ return s;
+ if (c == '"' || c == '\'')
+ quote = c;
+ }
+ return NULL;
+}
+
+/*
+ * Advance backward in string until reaching the char `toc`
+ * if beginning of string is reached w/o finding char return NULL
+ *
+ * /foo/bar'baz/booz'/foo
+ */
+const char *frrstr_back_to_char(const char *s, int toc)
+{
+ const char *next = s;
+ const char *prev = NULL;
+
+ if (s[0] == 0)
+ return NULL;
+ if (!strpbrk(s, "'\"\\"))
+ return strrchr(s, toc);
+ while ((next = frrstr_skip_over_char(next, toc)))
+ prev = next - 1;
+ return prev;
+}
+