1 files changed, 93 insertions, 0 deletions
diff --git a/src/util/str.c b/src/util/str.c
new file mode 100644
index 0000000..09bf822
--- /dev/null
+++ b/src/util/str.c
@@ -0,0 +1,93 @@
+#include "util/str.h"
+
+static bool match_char(char c, str tokens)
+{
+	for (size_t t = 0; t < tokens.len; t++)
+		if (c == tokens.ptr[t])
+			return true;
+
+	return false;
+}
+
+size_t str_find(str s, str tokens)
+{
+	for (size_t i = 0; i < s.len; i++)
+		if (match_char(s.ptr[i], tokens))
+			return i;
+
+	return s.len;
+}
+
+str str_walk(str *s, str sep)
+{
+	if (s->len == 0)
+		return (str) {};
+
+	size_t x = str_find(*s, sep);
+	size_t o = x + (x < s->len);
+
+	*s = str_advance(*s, o);
+
+    return (str) { x, s->ptr - o };
+}
+
+str str_eat(str s, str tokens)
+{
+	while (s.len > 0 && match_char(s.ptr[0], tokens))
+		s = str_advance(s, 1);
+	return s;
+}
+
+str str_advance(str s, size_t x)
+{
+	s.len -= x;
+	s.ptr += x;
+	return s;
+}
+
+bool str_start(str s, str start)
+{
+	if (s.len < start.len)
+		return false;
+	s.len = start.len;
+	return array_eq(s, start);
+}
+
+str str_intro(char *s)
+{
+    return (str) { strlen(s), s };
+}
+
+#include <stdio.h>
+
+#define PARSE_NUM(parse, ...) \
+    NULTERM(s, buf) \
+    char *end; \
+    auto v = parse(buf, &end); \
+    if (end != buf+s.len) \
+        return false; \
+    *x = v; \
+    return true;
+    
+
+bool str_parse_int(str s, long *x)
+{
+#define strtol_(start, endp) strtol(start, endp, 0)
+    PARSE_NUM(strtol_)
+#undef strtol_
+}
+
+bool str_parse_double(str s, double *x)
+{
+    PARSE_NUM(strtod)
+}
+
+bool str_split(str s, str sep, str *a, str *b)
+{
+    size_t x = str_find(s, sep);
+    if (x == s.len)
+        return false;
+    *a = (str) { x, s.ptr };
+    *b = str_advance(s, x+1);
+    return true;
+}