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engines/ags/shared/util/string_compat.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "ags/shared/util/string_compat.h"
+#include "ags/shared/core/platform.h"
+#include "ags/lib/allegro/error.h"
+#include "common/str.h"
+
+namespace AGS3 {
+
+char *ags_strlwr(char *s) {
+	char *p = s;
+	for (; *p; p++)
+		*p = (char)tolower(*p);
+	return s;
+}
+
+char *ags_strupr(char *s) {
+	char *p = s;
+	for (; *p; p++)
+		*p = (char)toupper(*p);
+	return s;
+}
+
+int ags_stricmp(const char *s1, const char *s2) {
+	return scumm_stricmp(s1, s2);
+}
+
+int ags_strnicmp(const char *s1, const char *s2, size_t n) {
+	return scumm_strnicmp(s1, s2, n);
+}
+
+char *ags_strdup(const char *s) {
+	size_t len = strlen(s);
+	char *result = (char *)malloc(len + 1);
+	memcpy(result, s, len + 1);
+	return result;
+}
+
+int ags_strncpy_s(char *dest, size_t dest_sz, const char *src, size_t count) {
+	// NOTE: implementation approximately mimics explanation for "strncpy_s":
+	// https://en.cppreference.com/w/c/string/byte/strncpy
+	assert(dest && dest_sz > 0 && ((dest + dest_sz - 1 < src) || (dest > src + count)));
+	if (!dest || dest_sz == 0 || ((dest <= src) && (dest + dest_sz - 1 >= src)) || ((src <= dest) && (src + count - 1 >= dest)))
+		return AL_EINVAL; // null buffer, or dest and src overlap
+	if (!src) {
+		dest[0] = 0; // ensure null terminator
+		return AL_EINVAL;
+	}
+
+	const size_t copy_len = (count < dest_sz - 1) ? count : dest_sz - 1; // reserve null-terminator
+	const char *psrc = src;
+	const char *src_end = src + copy_len;
+	char *pdst = dest;
+	for (; *psrc && (psrc != src_end); ++psrc, ++pdst)
+		*pdst = *psrc;
+	*pdst = 0; // ensure null terminator
+	assert((*psrc == 0) || ((psrc - src) == (int)count)); // assert that no *unintended* truncation occurred
+	if ((*psrc != 0) && ((psrc - src) < (int)count))
+		return AL_ERANGE; // not enough dest buffer - error
+	return 0; // success
+}
+
+} // namespace AGS3