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lifegpc
2022-05-07 16:25:39 +08:00
parent 930cac261b
commit 966aeb8d64
4 changed files with 104 additions and 0 deletions
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83
file_reader.c
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@@ -266,3 +266,86 @@ int file_reader_read_str(file_reader_file* f, char** buf) {
f->seek(f->f, offset, origin);
return 0;
}
int file_reader_read_line(file_reader_file* f, char** buf, size_t* buf_size) {
if (!f) return 1;
char* b = NULL;
char bu[128];
size_t blen = 128, n = 0, c = 0, tc = 0, pos = 0;
if (buf) {
b = malloc(blen);
if (!b) return 1;
}
int64_t offset = f->tell(f->f);
int origin = SEEK_SET;
if (offset == -1) {
origin = SEEK_CUR;
}
while (1) {
if (n >= c) {
if (!(tc = f->read(f->f, 128, bu))) {
if (c > 0) {
n--;
break;
}
if (b) free(b);
if (origin == SEEK_CUR) {
offset = -c;
}
f->seek(f->f, offset, origin);
return 1;
}
c += tc;
}
if (buf && n >= blen) {
size_t nlen = blen + 128;
char* nb = realloc(b, nlen);
if (!nb) {
if (b) free(b);
if (origin == SEEK_CUR) {
offset = -c;
}
f->seek(f->f, offset, origin);
return 1;
}
b = nb;
blen = nlen;
}
pos = n - (c - tc);
if (buf && b) {
b[n] = bu[pos];
}
if (bu[pos] == '\n') {
break;
}
n++;
}
if (origin == SEEK_SET) {
offset += n + 1;
} else {
offset = -(c - n - 1);
}
f->seek(f->f, offset, origin);
if (n >= 1 && b && b[n - 1] == '\r' && b[n] == '\n') {
n -= 2;
} else if (b && b[n] == '\n') {
n -= 1;
}
if (buf) {
char* nb = realloc(b, n + 2);
if (!nb) {
free(b);
if (origin == SEEK_CUR) {
offset = -c;
}
f->seek(f->f, offset, origin);
return 1;
}
nb[n + 1] = 0;
*buf = nb;
}
if (buf_size) {
*buf_size = n + 1;
}
return 0;
}