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cutils.c

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+/*
+ * Misc C utilities
+ * 
+ * Copyright (c) 2016-2017 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include <assert.h>
+#include <stdarg.h>
+#include <sys/time.h>
+#include <ctype.h>
+
+#include "cutils.h"
+
+void *mallocz(size_t size)
+{
+    void *ptr;
+    ptr = malloc(size);
+    if (!ptr)
+        return NULL;
+    memset(ptr, 0, size);
+    return ptr;
+}
+
+void pstrcpy(char *buf, int buf_size, const char *str)
+{
+    int c;
+    char *q = buf;
+
+    if (buf_size <= 0)
+        return;
+
+    for(;;) {
+        c = *str++;
+        if (c == 0 || q >= buf + buf_size - 1)
+            break;
+        *q++ = c;
+    }
+    *q = '\0';
+}
+
+char *pstrcat(char *buf, int buf_size, const char *s)
+{
+    int len;
+    len = strlen(buf);
+    if (len < buf_size)
+        pstrcpy(buf + len, buf_size - len, s);
+    return buf;
+}
+
+int strstart(const char *str, const char *val, const char **ptr)
+{
+    const char *p, *q;
+    p = str;
+    q = val;
+    while (*q != '\0') {
+        if (*p != *q)
+            return 0;
+        p++;
+        q++;
+    }
+    if (ptr)
+        *ptr = p;
+    return 1;
+}
+
+void dbuf_init(DynBuf *s)
+{
+    memset(s, 0, sizeof(*s));
+}
+
+void dbuf_write(DynBuf *s, size_t offset, const uint8_t *data, size_t len)
+{
+    size_t end, new_size;
+    new_size = end = offset + len;
+    if (new_size > s->allocated_size) {
+        new_size = max_int(new_size, s->allocated_size * 3 / 2);
+        s->buf = realloc(s->buf, new_size);
+        s->allocated_size = new_size;
+    }
+    memcpy(s->buf + offset, data, len);
+    if (end > s->size)
+        s->size = end;
+}
+
+void dbuf_putc(DynBuf *s, uint8_t c)
+{
+    dbuf_write(s, s->size, &c, 1);
+}
+
+void dbuf_putstr(DynBuf *s, const char *str)
+{
+    dbuf_write(s, s->size, (const uint8_t *)str, strlen(str));
+}
+
+void dbuf_free(DynBuf *s)
+{
+    free(s->buf);
+    memset(s, 0, sizeof(*s));
+}