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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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365_02
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tmp.c
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C/C++ Source or Header
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1992-04-04
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17KB
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760 lines
/* tmp.c */
/* Author:
* Steve Kirkendall
* 14407 SW Teal Blvd. #C
* Beaverton, OR 97005
* kirkenda@cs.pdx.edu
*/
/* This file contains functions which create & readback a TMPFILE */
#include "config.h"
#include "vi.h"
#if TOS
# include <stat.h>
#else
# if OSK
# include "osk.h"
# else
# if AMIGA
# include "amistat.h"
# else
# include <sys/stat.h>
# endif
# endif
#endif
#if TURBOC
# include <process.h>
#endif
#ifndef NO_MODELINES
static void do_modelines(l, stop)
long l; /* line number to start at */
long stop; /* line number to stop at */
{
char *str; /* used to scan through the line */
char *start; /* points to the start of the line */
char buf[80];
/* if modelines are disabled, then do nothing */
if (!*o_modelines)
{
return;
}
/* for each line... */
for (; l <= stop; l++)
{
/* for each position in the line.. */
for (str = fetchline(l); *str; str++)
{
/* if it is the start of a modeline command... */
if ((str[0] == 'e' && str[1] == 'x'
|| str[0] == 'v' && str[1] == 'i')
&& str[2] == ':')
{
start = str += 3;
/* find the end */
for (str = start + strlen(start); *--str != ':'; )
{
}
/* if it is a well-formed modeline, execute it */
if (str > start && str - start < sizeof buf)
{
strncpy(buf, start, (int)(str - start));
exstring(buf, str - start, '\\');
break;
}
}
}
}
}
#endif
/* The FAIL() macro prints an error message and then exits. */
#define FAIL(why,arg) mode = MODE_EX; msg(why, arg); endwin(); exit(9)
/* This is the name of the temp file */
static char tmpname[80];
/* This function creates the temp file and copies the original file into it.
* Returns if successful, or stops execution if it fails.
*/
int tmpstart(filename)
char *filename; /* name of the original file */
{
int origfd; /* fd used for reading the original file */
struct stat statb; /* stat buffer, used to examine inode */
REG BLK *this; /* pointer to the current block buffer */
REG BLK *next; /* pointer to the next block buffer */
int inbuf; /* number of characters in a buffer */
int nread; /* number of bytes read */
REG int j, k;
int i;
long nbytes;
/* switching to a different file certainly counts as a change */
changes++;
redraw(MARK_UNSET, FALSE);
/* open the original file for reading */
*origname = '\0';
if (filename && *filename)
{
strcpy(origname, filename);
origfd = open(origname, O_RDONLY);
if (origfd < 0 && errno != ENOENT)
{
msg("Can't open \"%s\"", origname);
return tmpstart("");
}
if (origfd >= 0)
{
if (stat(origname, &statb) < 0)
{
FAIL("Can't stat \"%s\"", origname);
}
#if TOS
if (origfd >= 0 && (statb.st_mode & S_IJDIR))
#else
# if OSK
if (origfd >= 0 && (statb.st_mode & S_IFDIR))
# else
if (origfd >= 0 && (statb.st_mode & S_IFMT) != S_IFREG)
# endif
#endif
{
msg("\"%s\" is not a regular file", origname);
return tmpstart("");
}
}
else
{
stat(".", &statb);
}
if (origfd >= 0)
{
origtime = statb.st_mtime;
#if OSK
if (*o_readonly || !(statb.st_mode &
((getuid() >> 16) == 0 ? S_IOWRITE | S_IWRITE :
((statb.st_gid != (getuid() >> 16) ? S_IOWRITE : S_IWRITE)))))
#endif
#if AMIGA || MSDOS || (TOS && defined(__GNUC__))
if (*o_readonly || !(statb.st_mode & S_IWRITE))
#endif
#if TOS && !defined(__GNUC__)
if (*o_readonly || (statb.st_mode & S_IJRON))
#endif
#if ANY_UNIX
if (*o_readonly || !(statb.st_mode &
((geteuid() == 0) ? 0222 :
((statb.st_uid != geteuid() ? 0022 : 0200)))))
#endif
#if VMS
if (*o_readonly)
#endif
{
setflag(file, READONLY);
}
}
else
{
origtime = 0L;
}
}
else
{
setflag(file, NOFILE);
origfd = -1;
origtime = 0L;
stat(".", &statb);
}
/* make a name for the tmp file */
tmpnum++;
#if MSDOS || TOS
/* MS-Dos doesn't allow multiple slashes, but supports drives
* with current directories.
* This relies on TMPNAME beginning with "%s\\"!!!!
*/
strcpy(tmpname, o_directory);
if ((i = strlen(tmpname)) && !strchr(":/\\", tmpname[i-1]))
tmpname[i++]=SLASH;
sprintf(tmpname+i, TMPNAME+3, getpid(), tmpnum);
#else
sprintf(tmpname, TMPNAME, o_directory, getpid(), tmpnum);
#endif
/* make sure nobody else is editing the same file */
if (access(tmpname, 0) == 0)
{
FAIL("Temp file \"%s\" already exists?", tmpname);
}
/* create the temp file */
#if ANY_UNIX
close(creat(tmpname, 0600)); /* only we can read it */
#else
close(creat(tmpname, FILEPERMS)); /* anybody body can read it, alas */
#endif
tmpfd = open(tmpname, O_RDWR | O_BINARY);
if (tmpfd < 0)
{
FAIL("Can't create temp file... Does directory \"%s\" exist?", o_directory);
return 1;
}
/* allocate space for the header in the file */
write(tmpfd, hdr.c, (unsigned)BLKSIZE);
write(tmpfd, tmpblk.c, (unsigned)BLKSIZE);
#ifndef NO_RECYCLE
/* initialize the block allocator */
/* This must already be done here, before the first attempt
* to write to the new file! GB */
garbage();
#endif
/* initialize lnum[] */
for (i = 1; i < MAXBLKS; i++)
{
lnum[i] = INFINITY;
}
lnum[0] = 0;
/* if there is no original file, then create a 1-line file */
if (origfd < 0)
{
hdr.n[0] = 0; /* invalid inode# denotes new file */
this = blkget(1); /* get the new text block */
strcpy(this->c, "\n"); /* put a line in it */
lnum[1] = 1L; /* block 1 ends with line 1 */
nlines = 1L; /* there is 1 line in the file */
nbytes = 1L;
if (*origname)
{
msg("\"%s\" [NEW FILE] 1 line, 1 char", origname);
}
else
{
msg("\"[NO FILE]\" 1 line, 1 char");
}
}
else /* there is an original file -- read it in */
{
nbytes = nlines = 0;
/* preallocate 1 "next" buffer */
i = 1;
next = blkget(i);
inbuf = 0;
/* loop, moving blocks from orig to tmp */
for (;;)
{
/* "next" buffer becomes "this" buffer */
this = next;
/* read [more] text into this block */
nread = tread(origfd, &this->c[inbuf], BLKSIZE - 1 - inbuf);
if (nread < 0)
{
close(origfd);
close(tmpfd);
tmpfd = -1;
unlink(tmpname);
FAIL("Error reading \"%s\"", origname);
}
/* convert NUL characters to something else */
for (j = k = inbuf; k < inbuf + nread; k++)
{
if (!this->c[k])
{
setflag(file, HADNUL);
this->c[j++] = 0x80;
}
#ifndef CRUNCH
else if (*o_beautify && this->c[k] < ' ' && this->c[k] > 0)
{
if (this->c[k] == '\t'
|| this->c[k] == '\n'
|| this->c[k] == '\f')
{
this->c[j++] = this->c[k];
}
else if (this->c[k] == '\b')
{
/* delete '\b', but complain */
setflag(file, HADBS);
}
/* else silently delete control char */
}
#endif
else
{
this->c[j++] = this->c[k];
}
}
inbuf = j;
/* if the buffer is empty, quit */
if (inbuf == 0)
{
goto FoundEOF;
}
#if MSDOS || TOS
/* BAH! MS text mode read fills inbuf, then compresses eliminating \r
but leaving garbage at end of buf. The same is true for TURBOC. GB. */
memset(this->c + inbuf, '\0', BLKSIZE - inbuf);
#endif
/* search backward for last newline */
for (k = inbuf; --k >= 0 && this->c[k] != '\n';)
{
}
if (k++ < 0)
{
if (inbuf >= BLKSIZE - 1)
{
k = 80;
}
else
{
k = inbuf;
}
}
/* allocate next buffer */
next = blkget(++i);
/* move fragmentary last line to next buffer */
inbuf -= k;
for (j = 0; k < BLKSIZE; j++, k++)
{
next->c[j] = this->c[k];
this->c[k] = 0;
}
/* if necessary, add a newline to this buf */
for (k = BLKSIZE - inbuf; --k >= 0 && !this->c[k]; )
{
}
if (this->c[k] != '\n')
{
setflag(file, ADDEDNL);
this->c[k + 1] = '\n';
}
/* count the lines in this block */
for (k = 0; k < BLKSIZE && this-