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Make mmap() work better

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- Mapping file offsets now works on Windows
- Mapping stack memory now works on OpenBSD
This commit is contained in:
Justine Tunney
2021-02-03 00:10:12 -08:00
parent 23a14b537c
commit 27c899af56
10 changed files with 71 additions and 56 deletions
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23
third_party/chibicc/tokenize.c vendored
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@@ -136,21 +136,16 @@ static int read_ident(char *start) {
}
}
static int from_hex(char c) {
if ('0' <= c && c <= '9') return c - '0';
if ('a' <= c && c <= 'f') return c - 'a' + 10;
return c - 'A' + 10;
}
// Read a punctuator token from p and returns its length.
int read_punct(char *p) {
static char kw[][4] = {"<<=", ">>=", "...", "==", "!=", "<=", ">=", "->",
"+=", "-=", "*=", "/=", "++", "--", "%=", "&=",
"|=", "^=", "&&", "||", "<<", ">>", "##"};
for (int i = 0; i < sizeof(kw) / sizeof(*kw); i++) {
static const char kPunct[][4] = {
"<<=", ">>=", "...", "==", "!=", "<=", ">=", "->", "+=", "-=", "*=", "/=",
"++", "--", "%=", "&=", "|=", "^=", "&&", "||", "<<", ">>", "##",
};
for (int i = 0; i < sizeof(kPunct) / sizeof(*kPunct); i++) {
for (int j = 0;;) {
if (p[j] != kw[i][j]) break;
if (!kw[i][++j]) return j;
if (p[j] != kPunct[i][j]) break;
if (!kPunct[i][++j]) return j;
}
}
return ispunct(*p) ? 1 : 0;
@@ -200,7 +195,7 @@ int read_escaped_char(char **new_pos, char *p) {
if (!isxdigit(*p)) error_at(p, "invalid hex escape sequence");
unsigned c = 0;
for (; isxdigit(*p); p++) {
c = (c << 4) + from_hex(*p); /* TODO(jart): overflow here unicode_test */
c = (c << 4) + hextoint(*p); /* TODO(jart): overflow here unicode_test */
}
*new_pos = p;
return c;
@@ -628,7 +623,7 @@ static uint32_t read_universal_char(char *p, int len) {
uint32_t c = 0;
for (int i = 0; i < len; i++) {
if (!isxdigit(p[i])) return 0;
c = (c << 4) | from_hex(p[i]);
c = (c << 4) | hextoint(p[i]);
}
return c;
}