ref: 5e010fd8a82ec3b6552b4002bcd4be0586081e9a
dir: /sys/src/libstdio/_IO_putc.c/
/* * pANS stdio -- _IO_putc, _IO_cleanup */ #include "iolib.h" void _IO_cleanup(void){ fflush(NULL); } /* * Look this over for simplification */ int _IO_putc(int c, FILE *f){ int cnt; static int first=1; switch(f->state){ case RD: f->state=ERR; case ERR: case CLOSED: return EOF; case OPEN: if(_IO_setvbuf(f)!=0) return EOF; /* fall through */ case RDWR: case END: f->rp=f->buf+f->bufl; if(f->flags&LINEBUF){ f->wp=f->rp; f->lp=f->buf; } else f->wp=f->buf; break; } if(first){ atexit(_IO_cleanup); first=0; } if(f->flags&STRING){ f->rp=f->buf+f->bufl; if(f->wp==f->rp){ if(f->flags&BALLOC){ char *t = realloc(f->buf, f->bufl+BUFSIZ); if(t==NULL){ f->state=ERR; return EOF; } f->buf=t; f->wp=t+f->bufl; f->bufl+=BUFSIZ; f->rp=t+f->bufl; }else{ f->state=ERR; return EOF; } } *f->wp++=c; } else if(f->flags&LINEBUF){ if(f->lp==f->rp){ cnt=f->lp-f->buf; if(f->flags&APPEND) seek(f->fd, 0L, 2); if(cnt!=0 && write(f->fd, f->buf, cnt)!=cnt){ f->state=ERR; return EOF; } f->lp=f->buf; } *f->lp++=c; if(c=='\n'){ cnt=f->lp-f->buf; if(f->flags&APPEND) seek(f->fd, 0L, 2); if(cnt!=0 && write(f->fd, f->buf, cnt)!=cnt){ f->state=ERR; return EOF; } f->lp=f->buf; } } else if(f->buf==f->unbuf){ f->unbuf[0]=c; if(f->flags&APPEND) seek(f->fd, 0L, 2); if(write(f->fd, f->buf, 1)!=1){ f->state=ERR; return EOF; } } else{ if(f->wp==f->rp){ cnt=f->wp-f->buf; if(f->flags&APPEND) seek(f->fd, 0L, 2); if(cnt!=0 && write(f->fd, f->buf, cnt)!=cnt){ f->state=ERR; return EOF; } f->wp=f->buf; f->rp=f->buf+f->bufl; } *f->wp++=c; } f->state=WR; /* * Make sure EOF looks different from putc(-1) * Should be able to cast to unsigned char, but * there's a vc bug preventing that from working */ return c&0xff; }