#include <stdio.h> #include <errno.h> FILE * _endopen(file, mode, iop) char *file, *mode; register FILE *iop; { extern int errno; register int rw, f; if (iop == NULL) return(NULL); rw = mode[1] == '+'; switch (*mode) { case 'w': f = create(file, rw); break; case 'a': if ((f = open(file, rw? 2: 1)) < 0) { if (errno == ENOENT) f = create(file, rw); } lseek(f, 0L, 2); break; case 'r': f = open(file, rw? 2: 0); break; default: return(NULL); } if (f < 0) return(NULL); iop->_cnt = 0; iop->_file = f; if (rw) iop->_flag |= _IORW; else if(*mode == 'r') iop->_flag |= _IOREAD; else iop->_flag |= _IOWRT; return(iop); } static int create(file, rw) register char *file; int rw; { register int f; f = creat(file, 0666); if (rw && f>=0) { close(f); f = open(file, 2); } return(f); }