Fix overflow issue

[platform/upstream/libxkbcommon.git] / src / utils.c

diff --git a/src/utils.c b/src/utils.c
index c417106..dbb0662 100644 (file)
--- a/src/utils.c
+++ b/src/utils.c
@@ -21,6 +21,8 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
+#include "config.h"
+
 #include "utils.h"
 
 #ifdef HAVE_MMAP
@@ -35,10 +37,13 @@ bool
 map_file(FILE *file, char **string_out, size_t *size_out)
 {
     struct stat stat_buf;
-    const int fd = fileno(file);
+    int fd;
     char *string;
 
     /* Make sure to keep the errno on failure! */
+    fd = fileno(file);
+    if (fd < 0)
+        return false;
 
     if (fstat(fd, &stat_buf) != 0)
         return false;
@@ -105,3 +110,101 @@ unmap_file(char *str, size_t size)
 }
 
 #endif
+
+// ASCII lower-case map.
+static const unsigned char lower_map[] = {
+    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
+    21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
+    40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58,
+    59, 60, 61, 62, 63, 64, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
+    108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122,
+    91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
+    108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122,
+    123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137,
+    138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152,
+    153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167,
+    168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182,
+    183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197,
+    198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212,
+    213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227,
+    228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242,
+    243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
+};
+
+// ASCII tolower (to avoid locale issues).
+char
+to_lower(char c)
+{
+    return (char) lower_map[(unsigned char) c];
+}
+
+// ASCII strcasecmp (to avoid locale issues).
+int
+istrcmp(const char *a, const char *b)
+{
+    for (size_t i = 0; ; i++) {
+        if (to_lower(a[i]) != to_lower(b[i]))
+            return (int) to_lower(a[i]) - (int) to_lower(b[i]);
+        if (!a[i])
+            break;
+    }
+    return 0;
+}
+
+// ASCII strncasecmp (to avoid locale issues).
+int
+istrncmp(const char *a, const char *b, size_t n)
+{
+    for (size_t i = 0; i < n; i++) {
+        if (to_lower(a[i]) != to_lower(b[i]))
+            return (int) to_lower(a[i]) - (int) to_lower(b[i]);
+        if (!a[i])
+            break;
+    }
+    return 0;
+}
+
+#if !(defined(HAVE_ASPRINTF) && HAVE_ASPRINTF)
+int
+asprintf(char **strp, const char *fmt, ...)
+{
+    int ret;
+    va_list ap;
+    va_start(ap, fmt);
+    ret = vasprintf(strp, fmt, ap);
+    va_end(ap);
+    return ret;
+}
+
+# if !(defined(HAVE_VASPRINTF) && HAVE_VASPRINTF)
+int
+vasprintf(char **strp, const char *fmt, va_list ap)
+{
+    int ret;
+    char *buf;
+    va_list ap_copy;
+
+    /*
+     * The value of the va_list parameter is undefined after the call to
+     * vsnprintf() returns: pass a copy to make sure "ap" remains valid.
+     */
+    va_copy(ap_copy, ap);
+    ret = vsnprintf(NULL, 0, fmt, ap_copy);
+    va_end(ap_copy);
+
+    if (ret < 0)
+        return ret;
+
+    if (!(buf = malloc(ret + 1)))
+        return -1;
+
+    if ((ret = vsnprintf(buf, ret + 1, fmt, ap)) < 0) {
+        free(buf);
+        return ret;
+    }
+
+    *strp = buf;
+    return ret;
+}
+# endif /* !HAVE_VASPRINTF */
+#endif /* !HAVE_ASPRINTF */