1 /* 2 * pANS stdio -- fwrite 3 */ 4 #include "iolib.h" 5 #include <string.h> 6 7 #define BIGN (BUFSIZ/2) 8 9 size_t fwrite(const void *p, size_t recl, size_t nrec, FILE *f){ 10 char *s; 11 int n, d; 12 13 s=(char *)p; 14 n=recl*nrec; 15 while(n>0){ 16 d=f->rp-f->wp; 17 if(d>0){ 18 if(d>n) 19 d=n; 20 memcpy(f->wp, s, d); 21 f->wp+=d; 22 }else{ 23 if(n>=BIGN && f->state==WR && !(f->flags&(STRING|LINEBUF)) && f->buf!=f->unbuf){ 24 d=f->wp-f->buf; 25 if(d>0){ 26 if(f->flags&APPEND) 27 lseek(f->fd, 0L, SEEK_END); 28 if(write(f->fd, f->buf, d)!=d){ 29 f->state=ERR; 30 goto ret; 31 } 32 f->wp=f->rp=f->buf; 33 } 34 if(f->flags&APPEND) 35 lseek(f->fd, 0L, SEEK_END); 36 d=write(f->fd, s, n); 37 if(d<=0){ 38 f->state=ERR; 39 goto ret; 40 } 41 }else{ 42 if(_IO_putc(*s, f)==EOF) 43 goto ret; 44 d=1; 45 } 46 } 47 s+=d; 48 n-=d; 49 } 50 ret: 51 return (s-(char *)p)/(recl?recl:1); 52 } 53