xref: /aosp_15_r20/external/musl/src/stdio/fgetln.c (revision c9945492fdd68bbe62686c5b452b4dc1be3f8453)
1*c9945492SAndroid Build Coastguard Worker #define _GNU_SOURCE
2*c9945492SAndroid Build Coastguard Worker #include "stdio_impl.h"
3*c9945492SAndroid Build Coastguard Worker #include <string.h>
4*c9945492SAndroid Build Coastguard Worker 
fgetln(FILE * f,size_t * plen)5*c9945492SAndroid Build Coastguard Worker char *fgetln(FILE *f, size_t *plen)
6*c9945492SAndroid Build Coastguard Worker {
7*c9945492SAndroid Build Coastguard Worker 	char *ret = 0, *z;
8*c9945492SAndroid Build Coastguard Worker 	ssize_t l;
9*c9945492SAndroid Build Coastguard Worker 	FLOCK(f);
10*c9945492SAndroid Build Coastguard Worker 	ungetc(getc_unlocked(f), f);
11*c9945492SAndroid Build Coastguard Worker 	if (f->rend && (z=memchr(f->rpos, '\n', f->rend - f->rpos))) {
12*c9945492SAndroid Build Coastguard Worker 		ret = (char *)f->rpos;
13*c9945492SAndroid Build Coastguard Worker 		*plen = ++z - ret;
14*c9945492SAndroid Build Coastguard Worker 		f->rpos = (void *)z;
15*c9945492SAndroid Build Coastguard Worker 	} else if ((l = getline(&f->getln_buf, (size_t[]){0}, f)) > 0) {
16*c9945492SAndroid Build Coastguard Worker 		*plen = l;
17*c9945492SAndroid Build Coastguard Worker 		ret = f->getln_buf;
18*c9945492SAndroid Build Coastguard Worker 	}
19*c9945492SAndroid Build Coastguard Worker 	FUNLOCK(f);
20*c9945492SAndroid Build Coastguard Worker 	return ret;
21*c9945492SAndroid Build Coastguard Worker }
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