fundamental: move several macros and functions into src/fundamental/

sd-boot has a copy of a subset of codes from libbasic. This makes
sd-boot share the code with libbasic, and dedup the code.

Note, startswith_no_case() is dropped from sd-boot, as
- it is not used,
- the previous implementation is not correct,
- gnu-efi does not have StrniCmp() or so.

1 files changed, 76 insertions, 0 deletions

diff --git a/src/fundamental/string-util-fundamental.c b/src/fundamental/string-util-fundamental.c
new file mode 100644
index 0000000000..a94bce6e3e
--- /dev/null
+++ b/src/fundamental/string-util-fundamental.c
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#ifndef SD_BOOT
+#include "macro.h"
+#endif
+#include "string-util-fundamental.h"
+
+sd_char *startswith(const sd_char *s, const sd_char *prefix) {
+        sd_size_t l;
+
+        assert(s);
+        assert(prefix);
+
+        l = strlen(prefix);
+        if (!strneq(s, prefix, l))
+                return NULL;
+
+        return (sd_char*) s + l;
+}
+
+#ifndef SD_BOOT
+sd_char *startswith_no_case(const sd_char *s, const sd_char *prefix) {
+        sd_size_t l;
+
+        assert(s);
+        assert(prefix);
+
+        l = strlen(prefix);
+        if (!strncaseeq(s, prefix, l))
+                return NULL;
+
+        return (sd_char*) s + l;
+}
+#endif
+
+sd_char* endswith(const sd_char *s, const sd_char *postfix) {
+        sd_size_t sl, pl;
+
+        assert(s);
+        assert(postfix);
+
+        sl = strlen(s);
+        pl = strlen(postfix);
+
+        if (pl == 0)
+                return (sd_char*) s + sl;
+
+        if (sl < pl)
+                return NULL;
+
+        if (strcmp(s + sl - pl, postfix) != 0)
+                return NULL;
+
+        return (sd_char*) s + sl - pl;
+}
+
+sd_char* endswith_no_case(const sd_char *s, const sd_char *postfix) {
+        sd_size_t sl, pl;
+
+        assert(s);
+        assert(postfix);
+
+        sl = strlen(s);
+        pl = strlen(postfix);
+
+        if (pl == 0)
+                return (sd_char*) s + sl;
+
+        if (sl < pl)
+                return NULL;
+
+        if (strcasecmp(s + sl - pl, postfix) != 0)
+                return NULL;
+
+        return (sd_char*) s + sl - pl;
+}