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Diffstat (limited to 'src/shared/util.c')
-rw-r--r--src/shared/util.c146
1 files changed, 128 insertions, 18 deletions
diff --git a/src/shared/util.c b/src/shared/util.c
index 7175e808b3..2385224fbb 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -1347,13 +1347,17 @@ char *cescape(const char *s) {
return r;
}
-static int cunescape_one(const char *p, size_t length, char *ret) {
+static int cunescape_one(const char *p, size_t length, char *ret, uint32_t *ret_unicode) {
int r = 1;
assert(p);
assert(*p);
assert(ret);
+ /* Unescapes C style. Returns the unescaped character in ret,
+ * unless we encountered a \u sequence in which case the full
+ * unicode character is returned in ret_unicode, instead. */
+
if (length != (size_t) -1 && length < 1)
return -EINVAL;
@@ -1410,15 +1414,92 @@ static int cunescape_one(const char *p, size_t length, char *ret) {
if (b < 0)
return -EINVAL;
- /* don't allow NUL bytes */
+ /* Don't allow NUL bytes */
if (a == 0 && b == 0)
return -EINVAL;
- *ret = (char) ((a << 4) | b);
+ *ret = (char) ((a << 4U) | b);
r = 3;
break;
}
+ case 'u': {
+ /* C++11 style 16bit unicode */
+
+ int a[4];
+ unsigned i;
+ uint32_t c;
+
+ if (length != (size_t) -1 && length < 5)
+ return -EINVAL;
+
+ for (i = 0; i < 4; i++) {
+ a[i] = unhexchar(p[1 + i]);
+ if (a[i] < 0)
+ return a[i];
+ }
+
+ c = ((uint32_t) a[0] << 12U) | ((uint32_t) a[1] << 8U) | ((uint32_t) a[2] << 4U) | (uint32_t) a[3];
+
+ /* Don't allow 0 chars */
+ if (c == 0)
+ return -EINVAL;
+
+ if (c < 128)
+ *ret = c;
+ else {
+ if (!ret_unicode)
+ return -EINVAL;
+
+ *ret = 0;
+ *ret_unicode = c;
+ }
+
+ r = 5;
+ break;
+ }
+
+ case 'U': {
+ /* C++11 style 32bit unicode */
+
+ int a[8];
+ unsigned i;
+ uint32_t c;
+
+ if (length != (size_t) -1 && length < 9)
+ return -EINVAL;
+
+ for (i = 0; i < 8; i++) {
+ a[i] = unhexchar(p[1 + i]);
+ if (a[i] < 0)
+ return a[i];
+ }
+
+ c = ((uint32_t) a[0] << 28U) | ((uint32_t) a[1] << 24U) | ((uint32_t) a[2] << 20U) | ((uint32_t) a[3] << 16U) |
+ ((uint32_t) a[4] << 12U) | ((uint32_t) a[5] << 8U) | ((uint32_t) a[6] << 4U) | (uint32_t) a[7];
+
+ /* Don't allow 0 chars */
+ if (c == 0)
+ return -EINVAL;
+
+ /* Don't allow invalid code points */
+ if (!unichar_is_valid(c))
+ return -EINVAL;
+
+ if (c < 128)
+ *ret = c;
+ else {
+ if (!ret_unicode)
+ return -EINVAL;
+
+ *ret = 0;
+ *ret_unicode = c;
+ }
+
+ r = 9;
+ break;
+ }
+
case '0':
case '1':
case '2':
@@ -1428,7 +1509,8 @@ static int cunescape_one(const char *p, size_t length, char *ret) {
case '6':
case '7': {
/* octal encoding */
- int a, b, c, m;
+ int a, b, c;
+ uint32_t m;
if (length != (size_t) -1 && length < 4)
return -EINVAL;
@@ -1450,11 +1532,11 @@ static int cunescape_one(const char *p, size_t length, char *ret) {
return -EINVAL;
/* Don't allow bytes above 255 */
- m = (a << 6) | (b << 3) | c;
+ m = ((uint32_t) a << 6U) | ((uint32_t) b << 3U) | (uint32_t) c;
if (m > 255)
return -EINVAL;
- *ret = (char) m;
+ *ret = m;
r = 3;
break;
}
@@ -1487,6 +1569,8 @@ int cunescape_length_with_prefix(const char *s, size_t length, const char *prefi
for (f = s, t = r + pl; f < s + length; f++) {
size_t remaining;
+ uint32_t u;
+ char c;
int k;
remaining = s + length - f;
@@ -1509,7 +1593,7 @@ int cunescape_length_with_prefix(const char *s, size_t length, const char *prefi
return -EINVAL;
}
- k = cunescape_one(f + 1, remaining - 1, t);
+ k = cunescape_one(f + 1, remaining - 1, &c, &u);
if (k < 0) {
if (flags & UNESCAPE_RELAX) {
/* Invalid escape code, let's take it literal then */
@@ -1521,8 +1605,14 @@ int cunescape_length_with_prefix(const char *s, size_t length, const char *prefi
return k;
}
+ if (c != 0)
+ /* Non-Unicode? Let's encode this directly */
+ *(t++) = c;
+ else
+ /* Unicode? Then let's encode this in UTF-8 */
+ t += utf8_encode_unichar(t, u);
+
f += k;
- t++;
}
*t = 0;
@@ -7198,16 +7288,22 @@ int unquote_first_word(const char **p, char **ret, UnquoteFlags flags) {
return -ENOMEM;
if (flags & UNQUOTE_CUNESCAPE) {
- r = cunescape_one(*p, (size_t) -1, &c);
+ uint32_t u;
+
+ r = cunescape_one(*p, (size_t) -1, &c, &u);
if (r < 0)
return -EINVAL;
(*p) += r - 1;
- }
- s[sz++] = c;
- state = VALUE;
+ if (c != 0)
+ s[sz++] = c; /* normal explicit char */
+ else
+ sz += utf8_encode_unichar(s, u); /* unicode chars we'll encode as utf8 */
+ } else
+ s[sz++] = c;
+ state = VALUE;
break;
case SINGLE_QUOTE:
@@ -7239,14 +7335,21 @@ int unquote_first_word(const char **p, char **ret, UnquoteFlags flags) {
return -ENOMEM;
if (flags & UNQUOTE_CUNESCAPE) {
- r = cunescape_one(*p, (size_t) -1, &c);
+ uint32_t u;
+
+ r = cunescape_one(*p, (size_t) -1, &c, &u);
if (r < 0)
return -EINVAL;
(*p) += r - 1;
- }
- s[sz++] = c;
+ if (c != 0)
+ s[sz++] = c;
+ else
+ sz += utf8_encode_unichar(s, u);
+ } else
+ s[sz++] = c;
+
state = SINGLE_QUOTE;
break;
@@ -7277,14 +7380,21 @@ int unquote_first_word(const char **p, char **ret, UnquoteFlags flags) {
return -ENOMEM;
if (flags & UNQUOTE_CUNESCAPE) {
- r = cunescape_one(*p, (size_t) -1, &c);
+ uint32_t u;
+
+ r = cunescape_one(*p, (size_t) -1, &c, &u);
if (r < 0)
return -EINVAL;
(*p) += r - 1;
- }
- s[sz++] = c;
+ if (c != 0)
+ s[sz++] = c;
+ else
+ sz += utf8_encode_unichar(s, u);
+ } else
+ s[sz++] = c;
+
state = DOUBLE_QUOTE;
break;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-22 10:23:48 +0000