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-rw-r--r--strtou.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/strtou.c b/strtou.c
new file mode 100644
index 0000000..7fe836f
--- /dev/null
+++ b/strtou.c
@@ -0,0 +1,59 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+
+unsigned int
+libsimple_strtou(const char *restrict nptr, char **restrict end, int base)
+{
+ unsigned long int r = strtoul(nptr, end, base);
+ if (r > UINT_MAX) {
+ r = UINT_MAX;
+ errno = ERANGE;
+ }
+ return (unsigned int)r;
+}
+
+
+#else
+#include "test.h"
+
+static void
+add_one(char *buf)
+{
+ char *p = strchr(buf, '\0');
+ while (*--p == '9')
+ *p = '0';
+ *p += 1;
+}
+
+int
+main(void)
+{
+ char str[128];
+ char *e;
+ sprintf(str, "0x%x", UINT_MAX);
+ errno = 0;
+ assert(strtou(str, NULL, 0) == UINT_MAX && !errno);
+ assert(strtou(str, NULL, 16) == UINT_MAX && !errno);
+ assert(strtou(&str[2], NULL, 16) == UINT_MAX && !errno);
+ assert(strtou(str, NULL, 10) == 0 && !errno);
+ assert(strtou(str, &e, 0) == UINT_MAX && !*e && !errno);
+ assert(strtou(str, &e, 10) == 0 && *e == 'x' && !errno);
+ sprintf(str, "0x%x ", UINT_MAX);
+ assert(strtou(str, &e, 16) == UINT_MAX && *e == ' ' && !errno);
+ sprintf(str, "%u", UINT_MAX);
+ assert(strtou(str, &e, 10) == UINT_MAX && !*e && !errno);
+ assert(strtou("1234", &e, 10) == 1234 && !*e && !errno);
+ assert(strtou("1234", &e, 8) == 01234 && !*e && !errno);
+ assert(strtou("01234", &e, 0) == 01234 && !*e && !errno);
+ sprintf(str, "%u", UINT_MAX);
+ add_one(str);
+ assert(strtou(str, &e, 10) == UINT_MAX && !*e && errno == ERANGE);
+ errno = 0;
+ assert(!strtou("1", &e, -10000) && errno == EINVAL);
+ errno = 0;
+ return 0;
+}
+
+#endif