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-rw-r--r--stptolower.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/stptolower.c b/stptolower.c
new file mode 100644
index 0000000..ce9dbf8
--- /dev/null
+++ b/stptolower.c
@@ -0,0 +1,61 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+char *
+libsimple_stptolower(char *d, const char *s) /* TODO man */
+{
+ size_t n;
+ char *ret;
+ if (d == s) {
+ for (; *d; d++)
+ *d = tolower(*d);
+ return d;
+ } else if (d < s) {
+ for (; *s; d++, s++)
+ *d = tolower(*s);
+ *d = '\0';
+ return d;
+ } else {
+ for (n = 0; s[n]; n++);
+ ret = &d[n];
+ do {
+ d[n] = tolower(s[n]);
+ } while (n--);
+ return ret;
+ }
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+ char buf[100];
+
+ stpcpy(buf, "ABCDEabcde12345");
+ assert(!strcmpnul(libsimple_stptolower(&buf[3], &buf[0]), ""));
+ assert(!strcmp(buf, "ABCabcdeabcde12345"));
+ stpcpy(buf, "ABCDEabcde12345");
+ assert(!strcmpnul(libsimple_stptolower(&buf[0], &buf[3]), ""));
+ assert(!strcmp(buf, "deabcde12345"));
+ stpcpy(buf, "ABCDEabcde12345");
+ assert(!strcmpnul(libsimple_stptolower(&buf[0], &buf[0]), ""));
+ assert(!strcmp(buf, "abcdeabcde12345"));
+ stpcpy(buf, "ABCDEabcde12345");
+ assert(!strcmpnul(libsimple_strtolower(&buf[3], &buf[0]), "abcdeabcde12345"));
+ assert(!strcmp(buf, "ABCabcdeabcde12345"));
+ stpcpy(buf, "ABCDEabcde12345");
+ assert(!strcmpnul(libsimple_strtolower(&buf[0], &buf[3]), "deabcde12345"));
+ assert(!strcmp(buf, "deabcde12345"));
+ stpcpy(buf, "ABCDEabcde12345");
+ assert(!strcmpnul(libsimple_strtolower(&buf[0], &buf[0]), "abcdeabcde12345"));
+ assert(!strcmp(buf, "abcdeabcde12345"));
+
+ return 0;
+}
+
+#endif