ref: e4509d40cc9759baddf1c2571247b95d2f5b61a5
dir: /sys/src/libString/s_read_line.c/
#include <u.h> #include <libc.h> #include <bio.h> #include "String.h" /* Append an input line to a String. * * Returns a pointer to the character string (or 0). * Trailing newline is left on. */ extern char * s_read_line(Biobuf *fp, String *to) { char *cp; int llen; if(to->ref > 1) sysfatal("can't s_read_line a shared string"); s_terminate(to); cp = Brdline(fp, '\n'); if(cp == 0) return 0; llen = Blinelen(fp); if(to->end - to->ptr < llen) s_grow(to, llen); memmove(to->ptr, cp, llen); cp = to->ptr; to->ptr += llen; s_terminate(to); return cp; }