Parse uint

1 files changed, 50 insertions, 0 deletions

diff --git a/pom.c b/pom.c
index ad3919c..87154e8 100644
--- a/pom.c
+++ b/pom.c
@@ -1535,3 +1535,53 @@ pom_conf_copy(const pom_conf *conf) {
 	}
 	return new_root;
 }
+
+static bool
+parse_uint(const char *s, uint64_t *val) {
+	if (*s == '+') s++;
+	if (*s == 0) {
+		// empty number
+		return false;
+	}
+	uint64_t value = 0;
+	if (*s == '0' && (s[1] == 'x' || s[1] == 'X')) {
+		// hexadecimal
+		for (size_t i = 2; s[i]; i++) {
+			if (parse_hex_digit(s[i]) == -1)
+				return false;
+		}
+		value = (uint64_t) strtoull(s, NULL, 16);
+	} else if (*s == '0') {
+		if (s[1] != 0) {
+			// leading zero
+			return false;
+		}
+	} else {
+		for (size_t i = 0; s[i]; i++) {
+			if (s[i] < '0' || s[i] > '9')
+				return false;
+		}
+		value = (uint64_t) strtoull(s, NULL, 10);
+	}
+	if (value >> 53) {
+		// too big!
+		return false;
+	}
+	*val = value;
+	return true;
+}
+
+const char *
+pom_conf_get_uint(const pom_conf *conf, const char *key, uint64_t *value_uint) {
+	check_conf(conf);
+	if (!key) fatal_error("NULL key passed to %s", __func__);
+	if (!value_uint) fatal_error("NULL value passed to %s", __func__);
+	*value_uint = 0;
+	const char *value_str = pom_conf_get(conf, key);
+	if (!value_str) {
+		return "";
+	}
+	if (parse_uint(value_str, value_uint))
+		return NULL;
+	return value_str;
+}