add buf_to_linearray

[libjh.git] / string.c

diff --git a/string.c b/string.c
index 5ef61b9..b0db54c 100644 (file)
--- a/string.c
+++ b/string.c
@@ -145,3 +145,23 @@ PUBLIC_FN int ends_with(char *str, char *sub) {
   if (sub_len>str_len) return 0;
   return streq(str+str_len-sub_len, sub);
 }
+
+PUBLIC_FN char **buf_to_linearray(char *buf, ssize_t buflen) {
+  if (buflen == -1) buflen = strlen(buf);
+  size_t linecount = count_char_occurences_in_buf(buf, buflen, '\n')+1;
+  char **ret = malloc(linecount * sizeof(char*) + 1);
+  ret[linecount] = NULL;
+  if (ret == NULL) return NULL;
+  char **r = ret;
+  *(r++) = buf; /* first line starts at byte zero */
+  char *b = buf;
+  char *be = buf+buflen;
+  while (b<be) {
+    if (*b == '\n') {
+      *b = '\0';
+      *(r++) = b+1;
+    }
+    b++;
+  }
+  return ret;
+}