replace pseudo UTF-8 with real wide character support

[smdp.git] / src / cstring.c

diff --git a/src/cstring.c b/src/cstring.c
index 1939572..1570786 100644 (file)
--- a/src/cstring.c
+++ b/src/cstring.c
@@ -19,45 +19,70 @@
  *
  */
 
-#include <string.h> // strlen
+#include <wchar.h> // wcslen, wcscat, wmemmove
+#include <stdio.h> // fprintf
 #include <stdlib.h> // malloc, realloc
 
 #include "cstring.h"
 
 cstring_t *cstring_init() {
-    cstring_t *x = malloc(sizeof(cstring_t));
-    x->text = (void*)0;
-    x->size = x->alloc = 0;
-    x->expand = cstring_expand;
-    x->expand_arr = cstring_expand_arr;
-    x->reset = cstring_reset;
-    x->delete = cstring_delete;
+    cstring_t *x = NULL;
+    if((x = malloc(sizeof(cstring_t))) != NULL) {
+        x->text = NULL;
+        x->size = x->alloc = 0;
+        x->expand = cstring_expand;
+        x->expand_arr = cstring_expand_arr;
+        x->strip = cstring_strip;
+        x->reset = cstring_reset;
+        x->delete = cstring_delete;
+    } else {
+        fprintf(stderr, "%s\n", "cstring_init() failed to allocate memory.");
+        exit(EXIT_FAILURE);
+    }
     return x;
 }
 
-void cstring_expand(cstring_t *self, char x) {
-    if(self->size + sizeof(x) + sizeof(char) > self->alloc) {
-        self->alloc += (REALLOC_ADD * sizeof(char));
-        self->text = realloc(self->text, self->alloc);
+void cstring_expand(cstring_t *self, wchar_t x) {
+    if((self->size + 2) * sizeof(wchar_t) > self->alloc) {
+        self->alloc += (REALLOC_ADD * sizeof(wchar_t));
+        if((self->text = realloc(self->text, self->alloc)) == NULL) {
+            fprintf(stderr, "%s\n", "cstring_expand() failed to reallocate memory.");
+            exit(EXIT_FAILURE);
+        }
     }
     self->text[self->size] = x;
-    self->text[self->size+1] = '\0';
-    self->size = strlen(self->text);
+    self->text[self->size+1] = L'\0';
+    self->size = wcslen(self->text);
 }
 
-void cstring_expand_arr(cstring_t *self, char *x) {
-    if(self->size + strlen(x) + sizeof(char) > self->alloc) {
-        self->alloc = ((strlen(x) + self->size + 1) * sizeof(char));
-        self->text = realloc(self->text, self->alloc);
+void cstring_expand_arr(cstring_t *self, wchar_t *x) {
+    if((self->size + wcslen(x) + 1) * sizeof(wchar_t) > self->alloc) {
+        self->alloc = ((self->size + wcslen(x) + 1) * sizeof(wchar_t));
+        if((self->text = realloc(self->text, self->alloc)) == NULL) {
+            fprintf(stderr, "%s\n", "cstring_expand_arr() failed to reallocate memory.");
+            exit(EXIT_FAILURE);
+        }
     }
-    self->text = strcat(self->text, x);
-    self->size = strlen(self->text);
-    self->text[self->size+1] = '\0';
+    self->text = wcscat(self->text, x);
+    self->size = wcslen(self->text);
+    self->text[self->size+1] = L'\0';
+}
+
+void cstring_strip(cstring_t *self, int pos, int len) {
+    if(pos + len >= self->size) {
+        if(pos <= self->size) {
+            self->text[pos] = L'\0';
+            self->size = pos;
+        }
+        return;
+    }
+    wmemmove(&self->text[pos], &self->text[pos+len], self->size - pos - len+1);
+    self->size -= len;
 }
 
 void cstring_reset(cstring_t *self) {
     free(self->text);
-    self->text = (void*)0;
+    self->text = NULL;
     self->size = self->alloc = 0;
 }
 
@@ -65,4 +90,3 @@ void cstring_delete(cstring_t *self) {
     free(self->text);
     free(self);
 }
-