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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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vol_300
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313_01
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fileio.c
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1990-04-21
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270 lines
/* $Header: /nw2/tony/src/stevie/src/RCS/fileio.c,v 1.12 89/08/06 09:50:01 tony Exp $
*
* Basic file I/O routines.
*/
#include "stevie.h"
void
filemess(s)
char *s;
{
smsg("\"%s\" %s", (Filename == NULL) ? "" : Filename, s);
flushbuf();
}
void
renum()
{
LPTR *p;
unsigned long l = 0;
for (p = Filemem; p != NULL ;p = nextline(p), l += LINEINC)
p->linep->num = l;
Fileend->linep->num = 0xffffffff;
}
#define MAXLINE 256 /* maximum size of a line */
bool_t
readfile(fname,fromp,nochangename)
char *fname;
LPTR *fromp;
bool_t nochangename; /* if TRUE, don't change the Filename */
{
FILE *f, *fopen();
register LINE *curr;
char buff[MAXLINE], buf2[80];
register int i, c;
register long nchars = 0;
int linecnt = 0;
bool_t wasempty = bufempty();
int nonascii = 0; /* count garbage characters */
int nulls = 0; /* count nulls */
bool_t incomplete = FALSE; /* was the last line incomplete? */
bool_t toolong = FALSE; /* a line was too long */
curr = fromp->linep;
if ( ! nochangename )
Filename = strsave(fname);
if ( (f=fopen(fixname(fname),"r")) == NULL )
return TRUE;
filemess("");
i = 0;
do {
c = getc(f);
if (c == EOF) {
if (i == 0) /* normal loop termination */
break;
/*
* If we get EOF in the middle of a line, note the
* fact and complete the line ourselves.
*/
incomplete = TRUE;
c = NL;
}
/*
* Abort if we get an interrupt, but finished reading the
* current line first.
*/
if (got_int && i == 0)
break;
if (c >= 0x80) {
c -= 0x80;
nonascii++;
}
/*
* If we reached the end of the line, OR we ran out of
* space for it, then process the complete line.
*/
if (c == NL || i == (MAXLINE-1)) {
LINE *lp;
if (c != NL)
toolong = TRUE;
buff[i] = '\0';
if ((lp = newline(strlen(buff))) == NULL)
exit(1);
strcpy(lp->s, buff);
curr->next->prev = lp; /* new line to next one */
lp->next = curr->next;
curr->next = lp; /* new line to prior one */
lp->prev = curr;
curr = lp; /* new line becomes current */
i = 0;
linecnt++;
} else if (c == NUL)
nulls++; /* count and ignore nulls */
else {
buff[i++] = c; /* normal character */
}
nchars++;
} while (!incomplete && !toolong);
fclose(f);
/*
* If the buffer was empty when we started, we have to go back
* and remove the "dummy" line at Filemem and patch up the ptrs.
*/
if (wasempty && nchars != 0) {
LINE *dummy = Filemem->linep; /* dummy line ptr */
free(dummy->s); /* free string space */
Filemem->linep = Filemem->linep->next;
free((char *)dummy); /* free LINE struct */
Filemem->linep->prev = Filetop->linep;
Filetop->linep->next = Filemem->linep;
Curschar->linep = Filemem->linep;
Topchar->linep = Filemem->linep;
}
renum();
if (got_int) {
smsg("\"%s\" Interrupt", fname);
got_int = FALSE;
return FALSE; /* an interrupt isn't really an error */
}
if (toolong) {
smsg("\"%s\" Line too long", fname);
return FALSE;
}
sprintf(buff, "\"%s\" %s%d line%s, %ld character%s",
fname,
incomplete ? "[Incomplete last line] " : "",
linecnt, (linecnt != 1) ? "s" : "",
nchars, (nchars != 1) ? "s" : "");
buf2[0] = NUL;
if (nonascii || nulls) {
if (nonascii) {
if (nulls)
sprintf(buf2, " (%d null, %d non-ASCII)",
nulls, nonascii);
else
sprintf(buf2, " (%d non-ASCII)", nonascii);
} else
sprintf(buf2, " (%d null)", nulls);
}
strcat(buff, buf2);
msg(buff);
return FALSE;
}
/*
* writeit - write to file 'fname' lines 'start' through 'end'
*
* If either 'start' or 'end' contain null line pointers, the default
* is to use the start or end of the file respectively.
*/
bool_t
writeit(fname, start, end)
char *fname;
LPTR *start, *end;
{
FILE *f, *fopen();
FILE *fopenb(); /* open in binary mode, where needed */
char *backup;
register char *s;
register long nchars;
register int lines;
register LPTR *p;
smsg("\"%s\"", fname);
/*
* Form the backup file name - change foo.* to foo.bak
*/
backup = alloc((unsigned) (strlen(fname) + 5));
strcpy(backup, fname);
for (s = backup; *s && *s != '.' ;s++)
;
*s = NUL;
strcat(backup, ".bak");
/*
* Delete any existing backup and move the current version
* to the backup. For safety, we don't remove the backup
* until the write has finished successfully. And if the
* 'backup' option is set, leave it around.
*/
rename(fname, backup);
f = P(P_CR) ? fopen(fixname(fname), "w") : fopenb(fixname(fname), "w");
if (f == NULL) {
emsg("Can't open file for writing!");
free(backup);
return FALSE;
}
/*
* If we were given a bound, start there. Otherwise just
* start at the beginning of the file.
*/
if (start == NULL || start->linep == NULL)
p = Filemem;
else
p = start;
lines = nchars = 0;
do {
fprintf(f, "%s\n", p->linep->s);
nchars += strlen(p->linep->s) + 1;
lines++;
/*
* If we were given an upper bound, and we just did that
* line, then bag it now.
*/
if (end != NULL && end->linep != NULL) {
if (end->linep == p->linep)
break;
}
} while ((p = nextline(p)) != NULL);
fclose(f);
smsg("\"%s\" %d line%s, %ld character%s", fname,
lines, (lines > 1) ? "s" : "",
nchars, (nchars > 1) ? "s" : "");
UNCHANGED;
/*
* Remove the backup unless they want it left around
*/
if (!P(P_BK))
remove(backup);
free(backup);
return TRUE;
}