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- #include <sys/types.h>
- #include <sys/stat.h>
- #include <stdio.h>
- #include "fio.h"
- #define STR(x) (x==NULL?"":x)
-
- /*global definitions*/
- unit units[MXUNIT]; /*unit table*/
- flag init; /*0 on entry, 1 after initializations*/
- cilist *elist; /*active external io list*/
- flag reading; /*1 if reading, 0 if writing*/
- flag cplus,cblank;
- char *fmtbuf;
- flag external; /*1 if external io, 0 if internal */
- int (*doed)(),(*doned)();
- int (*doend)(),(*donewrec)(),(*dorevert)();
- flag sequential; /*1 if sequential io, 0 if direct*/
- flag formatted; /*1 if formatted io, 0 if unformatted*/
- int (*getn)(),(*putn)(); /*for formatted io*/
- FILE *cf; /*current file*/
- unit *curunit; /*current unit*/
- int recpos; /*place in current record*/
- int cursor,scale;
-
- /*error messages*/
- char *F_err[]
- {
- "error in format",
- "illegal unit number",
- "formatted io not allowed",
- "unformatted io not allowed",
- "direct io not allowed",
- "sequential io not allowed",
- "can't backspace file",
- "null file name",
- "can't stat file",
- "unit not connected",
- "off end of record",
- "truncation failed in endfile",
- "incomprehensible list input",
- "out of free space",
- "unit not connected",
- "read unexpected character",
- "blank logical input field",
- };
- #define MAXERR (sizeof(F_err)/sizeof(char *)+100)
- fatal(n,s) char *s;
- {
- if(n<100 && n>=0) perror(s); /*SYSDEP*/
- else if(n>=(int)MAXERR)
- { fprintf(stderr,"%s: illegal error number %d\n",s,n);
- }
- else if(n<0) fprintf(stderr,"%s: end of file %d\n",s,n);
- else
- fprintf(stderr,"%s: %s\n",s,F_err[n-100]);
- fprintf(stderr,"apparent state: unit %d named %s\n",curunit-units,
- STR(curunit->ufnm));
- fprintf(stderr,"last format: %s\n",STR(fmtbuf));
- fprintf(stderr,"lately %s %s %s %s IO\n",reading?"reading":"writing",
- sequential?"sequential":"direct",formatted?"formatted":"unformatted",
- external?"external":"internal");
- _cleanup();
- abort();
- }
- /*initialization routine*/
- f_init()
- { unit *p;
- init=1;
- p= &units[0];
- p->ufd=stderr;
- p->useek=canseek(stderr);
- p->ufmt=1;
- p->uwrt=1;
- p = &units[5];
- p->ufd=stdin;
- p->useek=canseek(stdin);
- p->ufmt=1;
- p->uwrt=0;
- p= &units[6];
- p->ufd=stdout;
- p->useek=canseek(stdout);
- p->ufmt=1;
- p->uwrt=1;
- }
- canseek(f) FILE *f; /*SYSDEP*/
- { struct stat x;
- fstat(fileno(f),&x);
- if(x.st_nlink > 0 /*pipe*/ && !isatty(fileno(f)))
- {
- return(1);
- }
- return(0);
- }
- nowreading(x) unit *x;
- {
- long loc;
- x->uwrt=0;
- loc=ftell(x->ufd);
- freopen(x->ufnm,"r",x->ufd);
- fseek(x->ufd,loc,0);
- }
- nowwriting(x) unit *x;
- {
- long loc;
- loc=ftell(x->ufd);
- x->uwrt=1;
- freopen(x->ufnm,"a",x->ufd);
- fseek(x->ufd,loc,0);
- }
-