287 lines
7.9 KiB
C
287 lines
7.9 KiB
C
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/*
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*
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* Basic file I/O routines.
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*/
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#include "stevie.h"
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#include <io.h>
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#include <errno.h>
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void
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filemess(s)
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char *s;
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{
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smsg("\"%s\" %s", (Filename == NULL) ? "" : Filename, s);
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flushbuf();
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}
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void
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renum()
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{
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LNPTR *p;
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unsigned long l = 0;
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for (p = Filemem; p != NULL ;p = nextline(p), l += LINEINC)
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if (p->linep)
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p->linep->num = l;
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Fileend->linep->num = 0xffffffff;
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}
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#define MAXLINE 512 /* maximum size of a line */
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bool_t
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readfile(fname,fromp,nochangename)
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char *fname;
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LNPTR *fromp;
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bool_t nochangename; /* if TRUE, don't change the Filename */
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{
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FILE *f;
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register LINE *curr;
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char buff[MAXLINE], buf2[80];
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register int i, c;
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register long nchars = 0;
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int linecnt = 0;
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bool_t wasempty = bufempty();
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int nulls = 0; /* count nulls */
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bool_t incomplete = FALSE; /* was the last line incomplete? */
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bool_t toolong = FALSE; /* a line was too long */
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int ctoolong = 0;
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bool_t readonly = FALSE; /* file is not writable */
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curr = fromp->linep;
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if ( ! nochangename ) {
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Filename = strsave(fname);
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setviconsoletitle();
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}
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if((_access(fname,2) == -1) && (errno == EACCES)) {
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readonly = TRUE;
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}
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if ( (f=fopen(fixname(fname),"r")) == NULL )
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return TRUE;
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filemess("");
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i = 0;
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do {
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c = getc(f);
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if (c == EOF) {
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if (i == 0) /* normal loop termination */
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break;
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/*
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* If we get EOF in the middle of a line, note the
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* fact and complete the line ourselves.
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*/
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incomplete = TRUE;
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c = NL;
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}
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/*
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* Abort if we get an interrupt, but finished reading the
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* current line first.
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*/
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if (got_int && i == 0)
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break;
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/*
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* If we reached the end of the line, OR we ran out of
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* space for it, then process the complete line.
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*/
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if (c == NL || i == (MAXLINE-1)) {
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LINE *lp;
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if (c != NL) {
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toolong = TRUE;
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ctoolong++;
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}
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buff[i] = '\0';
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if ((lp = newline(strlen(buff))) == NULL)
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exit(1);
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strcpy(lp->s, buff);
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curr->next->prev = lp; /* new line to next one */
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lp->next = curr->next;
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curr->next = lp; /* new line to prior one */
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lp->prev = curr;
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curr = lp; /* new line becomes current */
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i = 0;
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linecnt++;
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if (toolong) {
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buff[i++] = (char)c;
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toolong = FALSE;
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}
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} else if (c == NUL)
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nulls++; /* count and ignore nulls */
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else {
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buff[i++] = (char)c; /* normal character */
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}
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nchars++;
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} while (!incomplete);
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fclose(f);
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/*
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* If the buffer was empty when we started, we have to go back
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* and remove the "dummy" line at Filemem and patch up the ptrs.
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*/
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if (wasempty && nchars != 0) {
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LINE *dummy = Filemem->linep; /* dummy line ptr */
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free(dummy->s); /* free string space */
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Filemem->linep = Filemem->linep->next;
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free((char *)dummy); /* free LINE struct */
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Filemem->linep->prev = Filetop->linep;
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Filetop->linep->next = Filemem->linep;
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Curschar->linep = Filemem->linep;
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Topchar->linep = Filemem->linep;
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}
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renum();
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if (got_int) {
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smsg("\"%s\" Interrupt", fname);
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got_int = FALSE;
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return FALSE; /* an interrupt isn't really an error */
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}
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if (ctoolong != 0) {
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smsg("\"%s\" %d Line(s) too long - split", fname, ctoolong);
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return FALSE;
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}
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sprintf(buff, "\"%s\" %s%s%d line%s, %ld character%s",
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fname,
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readonly ? "[Read only] " : "",
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incomplete ? "[Incomplete last line] " : "",
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linecnt, (linecnt != 1) ? "s" : "",
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nchars, (nchars != 1) ? "s" : "");
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buf2[0] = NUL;
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if (nulls) {
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sprintf(buf2, " (%d null)", nulls);
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}
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strcat(buff, buf2);
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msg(buff);
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return FALSE;
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}
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/*
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* writeit - write to file 'fname' lines 'start' through 'end'
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*
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* If either 'start' or 'end' contain null line pointers, the default
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* is to use the start or end of the file respectively.
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*/
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bool_t
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writeit(fname, start, end)
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char *fname;
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LNPTR *start, *end;
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{
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FILE *f;
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FILE *fopenb(); /* open in binary mode, where needed */
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char *backup;
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register char *s;
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register long nchars;
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register int lines;
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register LNPTR *p;
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if((_access(fname,2) == -1) && (errno == EACCES)) {
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msg("Write access to file is denied");
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return FALSE;
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}
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smsg("\"%s\"", fname);
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/*
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* Form the backup file name - change foo.* to foo.bak
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*/
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backup = alloc((unsigned) (strlen(fname) + 5));
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strcpy(backup, fname);
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for (s = backup; *s && *s != '.' ;s++)
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;
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*s = NUL;
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strcat(backup, ".bak");
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/*
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* Delete any existing backup and move the current version
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* to the backup. For safety, we don't remove the backup
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* until the write has finished successfully. And if the
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* 'backup' option is set, leave it around.
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*/
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rename(fname, backup);
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f = P(P_CR) ? fopen(fixname(fname), "w") : fopenb(fixname(fname), "w");
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if (f == NULL) {
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emsg("Can't open file for writing!");
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free(backup);
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return FALSE;
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}
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/*
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* If we were given a bound, start there. Otherwise just
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* start at the beginning of the file.
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*/
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if (start == NULL || start->linep == NULL)
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p = Filemem;
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else
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p = start;
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lines = nchars = 0;
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do {
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if (p->linep) {
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if (fprintf(f, "%s\n", p->linep->s) < 0) {
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emsg("Can't write file!");
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return FALSE;
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}
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nchars += strlen(p->linep->s) + 1;
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lines++;
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}
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/*
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* If we were given an upper bound, and we just did that
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* line, then bag it now.
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*/
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if (end != NULL && end->linep != NULL) {
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if (end->linep == p->linep)
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break;
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}
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} while ((p = nextline(p)) != NULL);
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fclose(f);
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smsg("\"%s\" %d line%s, %ld character%s", fname,
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lines, (lines > 1) ? "s" : "",
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nchars, (nchars > 1) ? "s" : "");
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UNCHANGED;
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/*
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* Remove the backup unless they want it left around
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*/
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if (!P(P_BK))
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remove(backup);
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free(backup);
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return TRUE;
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}
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