1 files changed, 101 insertions, 0 deletions
diff --git a/command.c b/command.c
new file mode 100644
index 0000000..d280766
--- /dev/null
+++ b/command.c
@@ -0,0 +1,101 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+enum command
+getcommand(const char **name_out, enum libhashsum_algorithm *algorithm_out)
+{
+	const char *name, *p;
+
+	name = strrchr(argv0, '/');
+	name = name ? &name[1] : argv0;
+
+	if (strstarts(name, "anysum")) {
+		name = &name[6];
+		while (isdigit(*name) || *name == '.' || *name == '_')
+			name++;
+		if (*name++ != '-')
+			return ANYSUM;
+	}
+
+	if (strcasestarts(name, "sha")) {
+		p = &name[3];
+		if (*p == '-')
+			p++;
+		if (*p++ == '3') {
+			if (!*p || !strcasecmp(p, "sum")) {
+				*algorithm_out = LIBHASHSUM_SHA3_224;
+				return SHA3SUM;
+			}
+		}
+	}
+
+	p = name;
+	if (*p != 'b' && *p != 'B')
+		goto specialised;
+	if (!strncasecmp(++p, "lake", 4))
+		p = &p[4];
+	if (*p && strcasecmp(p, "sum"))
+		goto specialised;
+	*name_out = "blake224";
+	*algorithm_out = LIBHASHSUM_BLAKE224;
+	return BSUM;
+
+specialised:
+	if (!libhashsum_get_algorithm_string(algorithm_out, name))
+		eprintf("invalid command name, is not \"anysum\" and "
+			"does not match any known hash function");
+	if (strchr(name, '['))
+		eprintf("invalid command name, cannot contain parameters");
+	*name_out = name;
+	return SPECIALISED;
+}
+
+
+enum command
+getsupercommand(enum command cmd, enum libhashsum_algorithm algo)
+{
+	if (cmd != SPECIALISED)
+		return cmd;
+	switch (algo) {
+	case LIBHASHSUM_MD2:
+	case LIBHASHSUM_MD4:
+	case LIBHASHSUM_MD5:
+	case LIBHASHSUM_RIPEMD_128:
+	case LIBHASHSUM_RIPEMD_160:
+	case LIBHASHSUM_RIPEMD_256:
+	case LIBHASHSUM_RIPEMD_320:
+	case LIBHASHSUM_SHA0:
+	case LIBHASHSUM_SHA1:
+	case LIBHASHSUM_SHA_224:
+	case LIBHASHSUM_SHA_256:
+	case LIBHASHSUM_SHA_384:
+	case LIBHASHSUM_SHA_512:
+	case LIBHASHSUM_SHA_512_224:
+	case LIBHASHSUM_SHA_512_256:
+		return SPECIALISED;
+	case LIBHASHSUM_KECCAK:
+	case LIBHASHSUM_KECCAK_224:
+	case LIBHASHSUM_KECCAK_256:
+	case LIBHASHSUM_KECCAK_384:
+	case LIBHASHSUM_KECCAK_512:
+	case LIBHASHSUM_SHA3_224:
+	case LIBHASHSUM_SHA3_256:
+	case LIBHASHSUM_SHA3_384:
+	case LIBHASHSUM_SHA3_512:
+	case LIBHASHSUM_SHAKE128:
+	case LIBHASHSUM_SHAKE256:
+	case LIBHASHSUM_SHAKE512:
+	case LIBHASHSUM_RAWSHAKE128:
+	case LIBHASHSUM_RAWSHAKE256:
+	case LIBHASHSUM_RAWSHAKE512:
+		return SHA3SUM;
+	case LIBHASHSUM_BLAKE224:
+	case LIBHASHSUM_BLAKE256:
+	case LIBHASHSUM_BLAKE384:
+	case LIBHASHSUM_BLAKE512:
+		return BSUM;
+	default:
+		eprintf("algorithm not recognised");
+	}
+}