+/* Make copy of src, replacing "from" with "to". */
+static char *replace(const void *ctx, const char *src,
+ const char *from, const char *to)
+{
+ char *ret = talloc_strdup(ctx, "");
+ unsigned int rlen, len, add;
+
+ rlen = len = 0;
+ for (;;) {
+ const char *next = strstr(src+len, from);
+ if (!next)
+ add = strlen(src+len) + 1;
+ else
+ add = next - (src+len);
+
+ ret = talloc_realloc(ctx, ret, char, rlen + add + strlen(to)+1);
+ memcpy(ret+rlen, src+len, add);
+ if (!next)
+ return ret;
+ len += add;
+ rlen += add;
+ strcpy(ret+rlen, to);
+ rlen += strlen(to);
+ len += strlen(from);
+ }
+}
+
+/* This is a terrible hack. We scan for ccan/ strings. */
+static char **get_one_safe_deps(const void *ctx,
+ const char *dir, unsigned int *num)
+{
+ char **deps, **lines, *raw, *fname;
+ unsigned int i, n = 0;
+
+ fname = talloc_asprintf(ctx, "%s/_info.c", dir);
+ raw = grab_file(fname, fname, NULL);
+ if (!raw)
+ errx(1, "Could not open %s", fname);
+
+ /* Replace \n by actual line breaks, and split it. */
+ lines = strsplit(raw, replace(raw, raw, "\\n", "\n"), "\n", &n);
+
+ deps = talloc_array(ctx, char *, n+1);
+
+ for (n = i = 0; lines[i]; i++) {
+ char *str;
+ unsigned int len;
+
+ /* Start of line, or after ". */
+ if (strstarts(lines[i], "ccan/"))
+ str = lines[i];
+ else {
+ str = strstr(lines[i], "\"ccan/");
+ if (!str)
+ continue;
+ str++;
+ }
+
+ len = strspn(str, "/abcdefghijklmnopqrstuvxwyz12345678980_");
+ if (len == 5)
+ continue;
+ deps[n++] = talloc_strndup(deps, str, len);
+ }
+ deps[n] = NULL;
+ talloc_free(fname);
+ if (num)
+ *num = n;
+ return deps;
+}
+