1 files changed, 315 insertions, 0 deletions
diff --git a/ta/ta_utils.c b/ta/ta_utils.c
new file mode 100644
index 0000000..6246968
--- /dev/null
+++ b/ta/ta_utils.c
@@ -0,0 +1,315 @@
+/* Copyright (C) 2017 the mpv developers
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <assert.h>
+#include "osdep/strnlen.h"
+
+#define TA_NO_WRAPPERS
+#include "ta.h"
+
+// Return element_size * count. If it overflows, return (size_t)-1 (SIZE_MAX).
+// I.e. this returns the equivalent of: MIN(element_size * count, SIZE_MAX).
+// The idea is that every real memory allocator will reject (size_t)-1, thus
+// this is a valid way to handle too large array allocation requests.
+size_t ta_calc_array_size(size_t element_size, size_t count)
+{
+    if (count > (((size_t)-1) / element_size))
+        return (size_t)-1;
+    return element_size * count;
+}
+
+// This is used when an array has to be enlarged for appending new elements.
+// Return a "good" size for the new array (in number of elements). This returns
+// a value > nextidx, unless the calculation overflows, in which case SIZE_MAX
+// is returned.
+size_t ta_calc_prealloc_elems(size_t nextidx)
+{
+    if (nextidx >= ((size_t)-1) / 2 - 1)
+        return (size_t)-1;
+    return (nextidx + 1) * 2;
+}
+
+/* Create an empty (size 0) TA allocation.
+ */
+void *ta_new_context(void *ta_parent)
+{
+    return ta_alloc_size(ta_parent, 0);
+}
+
+/* Set parent of ptr to ta_parent, return the ptr.
+ * Note that ta_parent==NULL will simply unset the current parent of ptr.
+ */
+void *ta_steal_(void *ta_parent, void *ptr)
+{
+    ta_set_parent(ptr, ta_parent);
+    return ptr;
+}
+
+/* Duplicate the memory at ptr with the given size.
+ */
+void *ta_memdup(void *ta_parent, void *ptr, size_t size)
+{
+    if (!ptr) {
+        assert(!size);
+        return NULL;
+    }
+    void *res = ta_alloc_size(ta_parent, size);
+    if (!res)
+        return NULL;
+    memcpy(res, ptr, size);
+    return res;
+}
+
+// *str = *str[0..at] + append[0..append_len]
+// (append_len being a maximum length; shorter if embedded \0s are encountered)
+static bool strndup_append_at(char **str, size_t at, const char *append,
+                              size_t append_len)
+{
+    assert(ta_get_size(*str) >= at);
+
+    if (!*str && !append)
+        return true; // stays NULL, but not an OOM condition
+
+    size_t real_len = append ? strnlen(append, append_len) : 0;
+    if (append_len > real_len)
+        append_len = real_len;
+
+    if (ta_get_size(*str) < at + append_len + 1) {
+        char *t = ta_realloc_size(NULL, *str, at + append_len + 1);
+        if (!t)
+            return false;
+        *str = t;
+    }
+
+    if (append_len)
+        memcpy(*str + at, append, append_len);
+
+    (*str)[at + append_len] = '\0';
+
+    ta_dbg_mark_as_string(*str);
+
+    return true;
+}
+
+/* Return a copy of str.
+ * Returns NULL on OOM.
+ */
+char *ta_strdup(void *ta_parent, const char *str)
+{
+    return ta_strndup(ta_parent, str, str ? strlen(str) : 0);
+}
+
+/* Return a copy of str. If the string is longer than n, copy only n characters
+ * (the returned allocation will be n+1 bytes and contain a terminating '\0').
+ * The returned string will have the length MIN(strlen(str), n)
+ * If str==NULL, return NULL. Returns NULL on OOM as well.
+ */
+char *ta_strndup(void *ta_parent, const char *str, size_t n)
+{
+    if (!str)
+        return NULL;
+    char *new = NULL;
+    strndup_append_at(&new, 0, str, n);
+    ta_set_parent(new, ta_parent);
+    return new;
+}
+
+/* Append a to *str. If *str is NULL, the string is newly allocated, otherwise
+ * ta_realloc() is used on *str as needed.
+ * Return success or failure (it can fail due to OOM only).
+ */
+bool ta_strdup_append(char **str, const char *a)
+{
+    return strndup_append_at(str, *str ? strlen(*str) : 0, a, (size_t)-1);
+}
+
+/* Like ta_strdup_append(), but use ta_get_size(*str)-1 instead of strlen(*str).
+ * (See also: ta_asprintf_append_buffer())
+ */
+bool ta_strdup_append_buffer(char **str, const char *a)
+{
+    size_t size = ta_get_size(*str);
+    if (size > 0)
+        size -= 1;
+    return strndup_append_at(str, size, a, (size_t)-1);
+}
+
+/* Like ta_strdup_append(), but limit the length of a with n.
+ * (See also: ta_strndup())
+ */
+bool ta_strndup_append(char **str, const char *a, size_t n)
+{
+    return strndup_append_at(str, *str ? strlen(*str) : 0, a, n);
+}
+
+/* Like ta_strdup_append_buffer(), but limit the length of a with n.
+ * (See also: ta_strndup())
+ */
+bool ta_strndup_append_buffer(char **str, const char *a, size_t n)
+{
+    size_t size = ta_get_size(*str);
+    if (size > 0)
+        size -= 1;
+    return strndup_append_at(str, size, a, n);
+}
+
+static bool ta_vasprintf_append_at(char **str, size_t at, const char *fmt,
+                                   va_list ap)
+{
+    assert(ta_get_size(*str) >= at);
+
+    int size;
+    va_list copy;
+    va_copy(copy, ap);
+    char c;
+    size = vsnprintf(&c, 1, fmt, copy);
+    va_end(copy);
+
+    if (size < 0)
+        return false;
+
+    if (ta_get_size(*str) < at + size + 1) {
+        char *t = ta_realloc_size(NULL, *str, at + size + 1);
+        if (!t)
+            return false;
+        *str = t;
+    }
+    vsnprintf(*str + at, size + 1, fmt, ap);
+
+    ta_dbg_mark_as_string(*str);
+
+    return true;
+}
+
+/* Like snprintf(); returns the formatted string as allocation (or NULL on OOM
+ * or snprintf() errors).
+ */
+char *ta_asprintf(void *ta_parent, const char *fmt, ...)
+{
+    char *res;
+    va_list ap;
+    va_start(ap, fmt);
+    res = ta_vasprintf(ta_parent, fmt, ap);
+    va_end(ap);
+    return res;
+}
+
+char *ta_vasprintf(void *ta_parent, const char *fmt, va_list ap)
+{
+    char *res = NULL;
+    ta_vasprintf_append_at(&res, 0, fmt, ap);
+    ta_set_parent(res, ta_parent);
+    if (!res) {
+        ta_free(res);
+        return NULL;
+    }
+    return res;
+}
+
+/* Append the formatted string to *str (after strlen(*str)). The allocation is
+ * ta_realloced if needed.
+ * Returns false on OOM or snprintf() errors, with *str left untouched.
+ */
+bool ta_asprintf_append(char **str, const char *fmt, ...)
+{
+    bool res;
+    va_list ap;
+    va_start(ap, fmt);
+    res = ta_vasprintf_append(str, fmt, ap);
+    va_end(ap);
+    return res;
+}
+
+bool ta_vasprintf_append(char **str, const char *fmt, va_list ap)
+{
+    return ta_vasprintf_append_at(str, *str ? strlen(*str) : 0, fmt, ap);
+}
+
+/* Append the formatted string at the end of the allocation of *str. It
+ * overwrites the last byte of the allocation too (which is assumed to be the
+ * '\0' terminating the string). Compared to ta_asprintf_append(), this is
+ * useful if you know that the string ends with the allocation, so that the
+ * extra strlen() can be avoided for better performance.
+ * Returns false on OOM or snprintf() errors, with *str left untouched.
+ */
+bool ta_asprintf_append_buffer(char **str, const char *fmt, ...)
+{
+    bool res;
+    va_list ap;
+    va_start(ap, fmt);
+    res = ta_vasprintf_append_buffer(str, fmt, ap);
+    va_end(ap);
+    return res;
+}
+
+bool ta_vasprintf_append_buffer(char **str, const char *fmt, va_list ap)
+{
+    size_t size = ta_get_size(*str);
+    if (size > 0)
+        size -= 1;
+    return ta_vasprintf_append_at(str, size, fmt, ap);
+}
+
+
+void *ta_oom_p(void *p)
+{
+    if (!p)
+        abort();
+    return p;
+}
+
+void ta_oom_b(bool b)
+{
+    if (!b)
+        abort();
+}
+
+char *ta_oom_s(char *s)
+{
+    if (!s)
+        abort();
+    return s;
+}
+
+void *ta_xmemdup(void *ta_parent, void *ptr, size_t size)
+{
+    void *new = ta_memdup(ta_parent, ptr, size);
+    ta_oom_b(new || !ptr);
+    return new;
+}
+
+void *ta_xrealloc_size(void *ta_parent, void *ptr, size_t size)
+{
+    ptr = ta_realloc_size(ta_parent, ptr, size);
+    ta_oom_b(ptr || !size);
+    return ptr;
+}
+
+char *ta_xstrdup(void *ta_parent, const char *str)
+{
+    char *res = ta_strdup(ta_parent, str);
+    ta_oom_b(res || !str);
+    return res;
+}
+
+char *ta_xstrndup(void *ta_parent, const char *str, size_t n)
+{
+    char *res = ta_strndup(ta_parent, str, n);
+    ta_oom_b(res || !str);
+    return res;
+}