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Be more strict about invalid UTF-8.

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This commit is contained in:
nicm
2015-11-14 10:56:31 +00:00
parent c56b81a2ce
commit 64333e3ef8
6 changed files with 76 additions and 54 deletions
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42
utf8.c
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@ -403,22 +403,26 @@ utf8_open(struct utf8_data *ud, u_char ch)
/*
* Append character to UTF-8, closing if finished.
*
* Returns 1 if more UTF-8 data to come, 0 if finished.
* Returns 1 if more UTF-8 data to come, 0 if finished and valid, -1 if
* finished and invalid.
*/
int
utf8_append(struct utf8_data *ud, u_char ch)
{
/* XXX this should do validity checks too! */
if (ud->have >= ud->size)
fatalx("UTF-8 character overflow");
if (ud->size > sizeof ud->data)
fatalx("UTF-8 character size too large");
if (ud->have != 0 && (ch & 0xc0) != 0x80)
ud->width = 0xff;
ud->data[ud->have++] = ch;
if (ud->have != ud->size)
return (1);
if (ud->width == 0xff)
return (-1);
ud->width = utf8_width(utf8_combine(ud));
return (0);
}
@ -556,15 +560,15 @@ utf8_strvis(char *dst, const char *src, size_t len, int flag)
while (src < end) {
if (utf8_open(&ud, *src)) {
more = 1;
while (++src < end && more)
while (++src < end && more == 1)
more = utf8_append(&ud, *src);
if (!more) {
if (more == 0) {
/* UTF-8 character finished. */
for (i = 0; i < ud.size; i++)
*dst++ = ud.data[i];
continue;
} else if (ud.have > 0) {
/* Not a complete UTF-8 character. */
/* Not a complete, valid UTF-8 character. */
src -= ud.have;
}
}
@ -600,9 +604,9 @@ utf8_sanitize(const char *src)
dst = xreallocarray(dst, n + 1, sizeof *dst);
if (utf8_open(&ud, *src)) {
more = 1;
while (*++src != '\0' && more)
while (*++src != '\0' && more == 1)
more = utf8_append(&ud, *src);
if (!more) {
if (more != 1) {
dst = xreallocarray(dst, n + ud.width,
sizeof *dst);
for (i = 0; i < ud.width; i++)
@ -612,10 +616,8 @@ utf8_sanitize(const char *src)
src -= ud.have;
}
if (*src > 0x1f && *src < 0x7f)
dst[n] = *src;
dst[n++] = *src;
src++;
n++;
}
dst = xreallocarray(dst, n + 1, sizeof *dst);
@ -641,18 +643,19 @@ utf8_fromcstr(const char *src)
dst = xreallocarray(dst, n + 1, sizeof *dst);
if (utf8_open(&dst[n], *src)) {
more = 1;
while (*++src != '\0' && more)
while (*++src != '\0' && more == 1)
more = utf8_append(&dst[n], *src);
if (!more) {
if (more != 1) {
n++;
continue;
}
src -= dst[n].have;
}
utf8_set(&dst[n], *src);
if (*src > 0x1f && *src < 0x7f) {
utf8_set(&dst[n], *src);
n++;
}
src++;
n++;
}
dst = xreallocarray(dst, n + 1, sizeof *dst);
@ -693,15 +696,16 @@ utf8_cstrwidth(const char *s)
while (*s != '\0') {
if (utf8_open(&tmp, *s)) {
more = 1;
while (*++s != '\0' && more)
while (*++s != '\0' && more == 1)
more = utf8_append(&tmp, *s);
if (!more) {
if (more != 1) {
width += tmp.width;
continue;
}
s -= tmp.have;
}
width++;
if (*s > 0x1f && *s < 0x7f)
width++;
s++;
}
return (width);