[libvirt] [PATCHv4 2/5] virstring.h/c: Util method for making some find and replace in strings
---
src/libvirt_private.syms | 1 +
src/util/virstring.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++
src/util/virstring.h | 2 ++
3 files changed, 51 insertions(+)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 99cc32a..b761fb6 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1750,6 +1750,7 @@ virStringListLength;
virStringSplit;
virStrncpy;
virStrndup;
+virStrReplace;
virStrToDouble;
virStrToLong_i;
virStrToLong_l;
diff --git a/src/util/virstring.c b/src/util/virstring.c
index d11db5c..a30a4ef 100644
--- a/src/util/virstring.c
+++ b/src/util/virstring.c
@@ -616,3 +616,51 @@ size_t virStringListLength(char **strings)
return i;
}
+
+/*
+ virStrReplace(haystack, oldneedle, newneedle) --
+ Search haystack and replace all occurences of oldneedle with newneedle.
+ Return a string with all the replacements in case of success, NULL in case
+ of failure
+*/
+char *
+virStrReplace(char *haystack,
+ const char *oldneedle, const char *newneedle)
+{
+ char *ret;
+ size_t i, count = 0;
+ size_t newneedle_len = strlen(newneedle);
+ size_t oldneedle_len = strlen(oldneedle);
+ size_t totalLength = 0;
+ if (strlen(oldneedle) == 0) {
+ ignore_value(VIR_STRDUP(ret, haystack));
+ goto cleanup;
+ }
+
+ for (i = 0; haystack[i] != '\0'; i++) {
+ if (strstr(&haystack[i], oldneedle) == &haystack[i]) {
+ count++;
+ i += oldneedle_len - 1;
+ }
+ }
+ if (VIR_ALLOC_N(ret, (i + count * (newneedle_len - oldneedle_len))) < 0) {
+ ret = NULL;
+ goto cleanup;
+ }
+ totalLength = sizeof(char *)*(i + count * (newneedle_len - oldneedle_len));
+ i = 0;
+ while (*haystack) {
+ if (strstr(haystack, oldneedle) == haystack) {
+ if (virStrcpy(&ret[i], newneedle, totalLength) == NULL) {
+ ret = NULL;
+ goto cleanup;
+ }
+ i += newneedle_len;
+ haystack += oldneedle_len;
+ } else
+ ret[i++] = *haystack++;
+ }
+ ret[i] = '\0';
+cleanup:
+ return ret;
+}
diff --git a/src/util/virstring.h b/src/util/virstring.h
index b390150..90522bd 100644
--- a/src/util/virstring.h
+++ b/src/util/virstring.h
@@ -223,4 +223,6 @@ size_t virStringListLength(char **strings);
virAsprintfInternal(false, 0, NULL, NULL, 0, \
strp, __VA_ARGS__)
+char * virStrReplace(char *haystack, const char *oldneedle, const char *newneedle);
+
#endif /* __VIR_STRING_H__ */
--
1.7.10.4