From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001 From: Vladimir Azarov Date: Tue, 1 Oct 2024 15:47:05 +0200 Subject: Initial version --- src/stdio/fgets.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 src/stdio/fgets.c (limited to 'src/stdio/fgets.c') diff --git a/src/stdio/fgets.c b/src/stdio/fgets.c new file mode 100644 index 0000000..4a100b3 --- /dev/null +++ b/src/stdio/fgets.c @@ -0,0 +1,49 @@ +#include "stdio_impl.h" +#include + +#define MIN(a,b) ((a)<(b) ? (a) : (b)) + +char *fgets(char *restrict s, int n, FILE *restrict f) +{ + char *p = s; + unsigned char *z; + size_t k; + int c; + + FLOCK(f); + + if (n<=1) { + f->mode |= f->mode-1; + FUNLOCK(f); + if (n<1) return 0; + *s = 0; + return s; + } + n--; + + while (n) { + if (f->rpos != f->rend) { + z = memchr(f->rpos, '\n', f->rend - f->rpos); + k = z ? z - f->rpos + 1 : f->rend - f->rpos; + k = MIN(k, n); + memcpy(p, f->rpos, k); + f->rpos += k; + p += k; + n -= k; + if (z || !n) break; + } + if ((c = getc_unlocked(f)) < 0) { + if (p==s || !feof(f)) s = 0; + break; + } + n--; + if ((*p++ = c) == '\n') break; + } + if (s) *p = 0; + + FUNLOCK(f); + + return s; +} + +weak_alias(fgets, fgets_unlocked); -- cgit v1.2.3