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-rw-r--r--src/basic/strxcpyx.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/src/basic/strxcpyx.c b/src/basic/strxcpyx.c
new file mode 100644
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+++ b/src/basic/strxcpyx.c
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+/*
+ * Concatenates/copies strings. In any case, terminates in all cases
+ * with '\0' and moves the @dest pointer forward to the added '\0'.
+ * Returns the remaining size, and 0 if the string was truncated.
+ *
+ * Due to the intended usage, these helpers silently noop invocations
+ * having zero size. This is technically an exception to the above
+ * statement "terminates in all cases". It's unexpected for such calls to
+ * occur outside of a loop where this is the preferred behavior.
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "strxcpyx.h"
+
+size_t strnpcpy(char **dest, size_t size, const char *src, size_t len) {
+ assert(dest);
+ assert(src);
+
+ if (size == 0)
+ return 0;
+
+ if (len >= size) {
+ if (size > 1)
+ *dest = mempcpy(*dest, src, size-1);
+ size = 0;
+ } else if (len > 0) {
+ *dest = mempcpy(*dest, src, len);
+ size -= len;
+ }
+
+ *dest[0] = '\0';
+ return size;
+}
+
+size_t strpcpy(char **dest, size_t size, const char *src) {
+ assert(dest);
+ assert(src);
+
+ return strnpcpy(dest, size, src, strlen(src));
+}
+
+size_t strpcpyf(char **dest, size_t size, const char *src, ...) {
+ va_list va;
+ int i;
+
+ assert(dest);
+ assert(src);
+
+ if (size == 0)
+ return 0;
+
+ va_start(va, src);
+ i = vsnprintf(*dest, size, src, va);
+ if (i < (int)size) {
+ *dest += i;
+ size -= i;
+ } else
+ size = 0;
+ va_end(va);
+ return size;
+}
+
+size_t strpcpyl(char **dest, size_t size, const char *src, ...) {
+ va_list va;
+
+ assert(dest);
+ assert(src);
+
+ va_start(va, src);
+ do {
+ size = strpcpy(dest, size, src);
+ src = va_arg(va, char *);
+ } while (src);
+ va_end(va);
+ return size;
+}
+
+size_t strnscpy(char *dest, size_t size, const char *src, size_t len) {
+ char *s;
+
+ assert(dest);
+ assert(src);
+
+ s = dest;
+ return strnpcpy(&s, size, src, len);
+}
+
+size_t strscpy(char *dest, size_t size, const char *src) {
+ assert(dest);
+ assert(src);
+
+ return strnscpy(dest, size, src, strlen(src));
+}
+
+size_t strscpyl(char *dest, size_t size, const char *src, ...) {
+ va_list va;
+ char *s;
+
+ assert(dest);
+ assert(src);
+
+ va_start(va, src);
+ s = dest;
+ do {
+ size = strpcpy(&s, size, src);
+ src = va_arg(va, char *);
+ } while (src);
+ va_end(va);
+
+ return size;
+}