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better hash_file function (more precise cr/lf scanning)

This commit is contained in:
Stefan Frederik 2021-12-10 03:05:53 +01:00
parent 53d508858c
commit 5270d41d8d
1 changed files with 11 additions and 1 deletions
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12
src/actions.c
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@ -39,6 +39,7 @@ unsigned int hash_file(const char *f)
{
int fd;
int n, i;
int cr = 0;
unsigned int h=5381;
unsigned char line[4096];
fd = open(f, O_RDONLY);
@ -46,10 +47,19 @@ unsigned int hash_file(const char *f)
while( (n = read(fd, line, sizeof(line))) ) {
for(i = 0; i < n; i++) {
/* skip CRs so hashes will match on unix / windows */
if(i < n - 1 && line[i] == '\r' && line[i+1] == '\n') continue;
if(line[i] == '\r') {
cr = 1;
continue;
} else if(line[i] == '\n' && cr) {
cr = 0;
} else if(cr) { /* no skip \r if not followed by \n */
cr = 0;
h += (h << 5) + '\r';
}
h += (h << 5) + line[i];
}
}
if(cr) h += (h << 5) + '\r'; /* file ends with \r not followed by \n: keep it */
close(fd);
return h;
} else {