Category : C Source Code
Archive   : F2CSRC.ZIP
Filename : ERR.C

#include "sys/types.h"
#ifndef MSDOS
#include "sys/stat.h"
#endif
#include "f2c.h"
#include "fio.h"
#include "fcntl.h"
#ifndef O_WRONLY
#define O_WRONLY 1
#endif

extern FILE *fdopen();

/*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", /* 100 */
"illegal unit number", /* 101 */
"formatted io not allowed", /* 102 */
"unformatted io not allowed", /* 103 */
"direct io not allowed", /* 104 */
"sequential io not allowed", /* 105 */
"can't backspace file", /* 106 */
"null file name", /* 107 */
"can't stat file", /* 108 */
"unit not connected", /* 109 */
"off end of record", /* 110 */
"truncation failed in endfile", /* 111 */
"incomprehensible list input", /* 112 */
"out of free space", /* 113 */
"unit not connected", /* 114 */
"read unexpected character", /* 115 */
"bad logical input field", /* 116 */
"bad variable type", /* 117 */
"bad namelist name", /* 118 */
"variable not in namelist", /* 119 */
"no end record", /* 120 */
"variable count incorrect", /* 121 */
"subscript for scalar variable", /* 122 */
"invalid array section", /* 123 */
"substring out of bounds", /* 124 */
"subscript out of bounds", /* 125 */
"can't read file", /* 126 */
"can't write file", /* 127 */
"'new' file exists" /* 128 */
};
#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 || n < -1)
{ fprintf(stderr,"%s: illegal error number %d\n",s,n);
}
else if(n == -1) fprintf(stderr,"%s: end of file\n",s);
else
fprintf(stderr,"%s: %s\n",s,F_err[n-100]);
if (curunit) {
fprintf(stderr,"apparent state: unit %d ",curunit-units);
fprintf(stderr, curunit->ufnm ? "named %s\n" : "(unnamed)\n",
curunit->ufnm);
}
else
fprintf(stderr,"apparent state: internal I/O\n");
if (fmtbuf)
fprintf(stderr,"last format: %s\n",fmtbuf);
fprintf(stderr,"lately %s %s %s %s",reading?"reading":"writing",
sequential?"sequential":"direct",formatted?"formatted":"unformatted",
external?"external":"internal");
sig_die(" IO", 1);
}
/*initialization routine*/
f_init()
{ unit *p;

init=1;
p= &units[0];
p->ufd=stderr;
p->useek=canseek(stderr);
#ifdef COMMENTED_OUT
if(isatty(fileno(stderr))) {
extern char *malloc();
setbuf(stderr, malloc(BUFSIZ));
/* setvbuf(stderr, _IOLBF, 0, 0); */
} /* wastes space, but win for debugging in windows */
#endif
#ifdef NON_UNIX_STDIO
{extern char *malloc(); setbuf(stderr, malloc(BUFSIZ));}
#else
stderr->_flag &= ~_IONBF;
#endif
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);
/* IOLBUF and setvbuf only in system 5+ */
#ifdef COMMENTED_OUT
if(isatty(fileno(stdout))) {
extern char _sobuf[];
setbuf(stdout, _sobuf);
/* setvbuf(stdout, _IOLBF, 0, 0); /* the buf arg in setvbuf? */
p->useek = 1; /* only within a record no bigger than BUFSIZ */
}
#endif
p->ufmt=1;
p->uwrt=1;
}
canseek(f) FILE *f; /*SYSDEP*/
{
#ifdef MSDOS
return !isatty(fileno(f));
#else
struct stat x;

if (fstat(fileno(f),&x) < 0)
return(0);
#ifdef S_IFMT
switch(x.st_mode & S_IFMT) {
case S_IFDIR:
case S_IFREG:
if(x.st_nlink > 0) /* !pipe */
return(1);
else
return(0);
case S_IFCHR:
if(isatty(fileno(f)))
return(0);
return(1);
#ifdef S_IFBLK
case S_IFBLK:
return(1);
#endif
}
#else
#ifdef S_ISDIR
/* POSIX version */
if (S_ISREG(x.st_mode) || S_ISDIR(x.st_mode)) {
if(x.st_nlink > 0) /* !pipe */
return(1);
else
return(0);
}
if (S_ISCHR(x.st_mode)) {
if(isatty(fileno(f)))
return(0);
return(1);
}
if (S_ISBLK(x.st_mode))
return(1);
#else
Help! How does fstat work on this system?
#endif
#endif
return(0); /* who knows what it is? */
#endif
}
nowreading(x) unit *x;
{
long loc;
if (!x->ufnm)
goto cantread;
loc=ftell(x->ufd);
if(freopen(x->ufnm,"r",x->ufd) == NULL) {
cantread:
errno = 126;
return(1);
}
x->uwrt=0;
(void) fseek(x->ufd,loc,SEEK_SET);
return(0);
}
nowwriting(x) unit *x;
{
long loc;
int k;

if (!x->ufnm)
goto cantwrite;
if (x->uwrt == 3) { /* just did write, rewind */
if (close(creat(x->ufnm,0666)))
goto cantwrite;
}
else {
loc=ftell(x->ufd);
if (fclose(x->ufd) < 0
|| (k = x->uwrt == 2 ? creat(x->ufnm,0666)
: open(x->ufnm,O_WRONLY)) < 0
|| (cf = x->ufd = fdopen(k,"w")) == NULL) {
x->ufd = NULL;
cantwrite:
errno = 127;
return(1);
}
(void) fseek(x->ufd,loc,SEEK_SET);
}
x->uwrt = 1;
return(0);
}