Add replacement

Signed-off-by: Mattias Andrée <m@maandree.se>

1 files changed, 42 insertions, 0 deletions

diff --git a/libcharconv_replacement.c b/libcharconv_replacement.c
new file mode 100644
index 0000000..a9bd3c5
--- /dev/null
+++ b/libcharconv_replacement.c
@@ -0,0 +1,42 @@
+/* See LICENSE file for copyright and license details. */
+#include "libcharconv.h"
+#include <strings.h>
+
+
+enum libcharconv_result
+libcharconv_replacement(const char *s, size_t slen, size_t *n, uint_least32_t *cp, size_t *ncp)
+{
+	uint_least32_t c;
+	*n = 0;
+	while (slen) {
+		if (slen < 3u && !strncasecmp(s, "obj", slen)) {
+			if (*n)
+				goto no_conv;
+			return LIBCHARCONV_INDETERMINATE;
+		} else if (slen >= 3u && !strncasecmp(s, "obj", 3u)) {
+			if (*n)
+				goto no_conv;
+			c = UINT32_C(0xFFFC);
+			*n = 3u;
+			goto conv;
+		} else if (*s == '?') {
+			if (*n)
+				goto no_conv;
+			c = UINT32_C(0xFFFD);
+			*n = 1u;
+			goto conv;
+		} else {
+			*n += 1u;
+			s++;
+			slen--;
+		}
+	}
+no_conv:
+	return LIBCHARCONV_NO_CONVERT;
+
+conv:
+	if (*ncp)
+		*cp = c;
+	*ncp = 1u;
+	return LIBCHARCONV_CONVERTED;
+}