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-rw-r--r--memptolower.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/memptolower.c b/memptolower.c
new file mode 100644
index 0000000..de813e5
--- /dev/null
+++ b/memptolower.c
@@ -0,0 +1,60 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+void *
+libsimple_memptolower(void *d_, const void *s_, size_t n) /* TODO man */
+{
+ char *ret, *d = d_;
+ const char *s = s_;
+ if (d == s) {
+ for (; n; d++, n--)
+ *d = tolower(*d);
+ return d;
+ } else if (d < s) {
+ for (; n; d++, s++, n--)
+ *d = tolower(*s);
+ return d;
+ } else {
+ ret = &d[n];
+ while (n) {
+ n--;
+ d[n] = tolower(s[n]);
+ }
+ return ret;
+ }
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+ char buf[100];
+
+ stpcpy(buf, "ABCDEabcde12345");
+ assert(libsimple_memptolower(&buf[3], &buf[0], 16) == &buf[19]);
+ assert(!strcmp(buf, "ABCabcdeabcde12345"));
+ stpcpy(buf, "ABCDEabcde12345");
+ assert(libsimple_memptolower(&buf[0], &buf[3], 13) == &buf[13]);
+ assert(!strcmp(buf, "deabcde12345"));
+ stpcpy(buf, "ABCDEabcde12345");
+ assert(libsimple_memptolower(&buf[0], &buf[0], 16) == &buf[16]);
+ assert(!strcmp(buf, "abcdeabcde12345"));
+ stpcpy(buf, "ABCDEabcde12345");
+ assert(!strcmpnul(libsimple_memtolower(&buf[3], &buf[0], 16), "abcdeabcde12345"));
+ assert(!strcmp(buf, "ABCabcdeabcde12345"));
+ stpcpy(buf, "ABCDEabcde12345");
+ assert(!strcmpnul(libsimple_memtolower(&buf[0], &buf[3], 13), "deabcde12345"));
+ assert(!strcmp(buf, "deabcde12345"));
+ stpcpy(buf, "ABCDEabcde12345");
+ assert(!strcmpnul(libsimple_memtolower(&buf[0], &buf[0], 16), "abcdeabcde12345"));
+ assert(!strcmp(buf, "abcdeabcde12345"));
+
+ return 0;
+}
+
+#endif