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file.c
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/*
* file - file I/O routines callable by users
*
* Copyright (C) 1999-2007 David I. Bell and Landon Curt Noll
*
* Primary author: David I. Bell
*
* Calc is open software; you can redistribute it and/or modify it under
* the terms of the version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* Calc is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
* Public License for more details.
*
* A copy of version 2.1 of the GNU Lesser General Public License is
* distributed with calc under the filename COPYING-LGPL. You should have
* received a copy with calc; if not, write to Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Under source code control: 1991/07/20 00:21:56
* File existed as early as: 1991
*
* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include "have_unistd.h"
#if defined(HAVE_UNISTD_H)
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <ctype.h>
#include "calc.h"
#include "longbits.h"
#include "have_fpos.h"
#include "have_fpos_pos.h"
#include "fposval.h"
#include "file.h"
#include "calcerr.h"
#if defined(_WIN32)
# include <io.h>
#endif
#define READSIZE 1024 /* buffer size for reading */
/*
* external STDIO functions
*/
E_FUNC void math_setfp(FILE *fp);
E_FUNC FILE *f_open(char *name, char *mode);
/*
* Table of opened files.
* The first three entries always correspond to stdin, stdout, and stderr,
* and cannot be closed. Their file ids are always 0, 1, and 2.
*/
STATIC FILEIO files[MAXFILES] = {
{FILEID_STDIN, NULL, (dev_t)0, (ino_t)0,
"(stdin)", TRUE, FALSE, FALSE, FALSE, 'r', "r"},
{FILEID_STDOUT, NULL, (dev_t)0, (ino_t)0,
"(stdout)", FALSE, TRUE, FALSE, FALSE, 'w', "w"},
{FILEID_STDERR, NULL, (dev_t)0, (ino_t)0,
"(stderr)", FALSE, TRUE, FALSE, FALSE, 'w', "w"}
};
STATIC int ioindex[MAXFILES] = {0,1,2}; /* Indices for FILEIO table */
STATIC FILEID lastid = FILEID_STDERR; /* Last allocated file id */
STATIC int idnum = 3; /* Number of allocated file ids */
/* forward static declarations */
S_FUNC ZVALUE filepos2z(FILEPOS pos);
S_FUNC FILEPOS z2filepos(ZVALUE pos);
S_FUNC int set_open_pos(FILE *fp, ZVALUE zpos);
S_FUNC int get_open_pos(FILE *fp, ZVALUE *res);
S_FUNC ZVALUE off_t2z(off_t siz);
S_FUNC ZVALUE dev2z(dev_t dev);
S_FUNC ZVALUE inode2z(ino_t inode);
S_FUNC void getscanfield(FILE *fp, BOOL skip, unsigned int width,
int scannum, char *scanptr, char **strptr);
S_FUNC void getscanwhite(FILE *fp, BOOL skip, unsigned int width,
int scannum, char **strptr);
S_FUNC int fscanfile(FILE *fp, char *fmt, int count, VALUE **vals);
S_FUNC void freadnum(FILE *fp, VALUE *valptr);
S_FUNC void freadsum(FILE *fp, VALUE *valptr);
S_FUNC void freadprod(FILE *fp, VALUE *valptr);
S_FUNC void fskipnum(FILE *fp);
/*
* file_init - perform needed initilization work
*
* On some systems, one cannot initialize a pointer to a FILE *.
* This routine, called once at startup is a work-a-round for
* systems with such bogons.
*
* We will also probe for any open files beyond stderr and set them up.
*/
void
file_init(void)
{
STATIC int done = 0; /* 1 => routine already called */
struct stat sbuf; /* file status */
FILEIO *fiop;
FILE *fp;
int i;
if (!done) {
/*
* setup the default set
*/
files[0].fp = stdin;
files[1].fp = stdout;
files[2].fp = stderr;
for (i = 0; i < 3; ++i) {
if (fstat(i, &sbuf) >= 0) {
files[i].dev = sbuf.st_dev;
files[i].inode = sbuf.st_ino;
}
}
/*
* note any other files that we can find
*/
fiop = &files[3];
for (i = 3; i < MAXFILES; fiop++, ++i) {
char *tname;
fiop->name = NULL;
files[idnum].reading = TRUE;
files[idnum].writing = TRUE;
files[idnum].action = 0;
/*
* stat the descriptor to see what we have
*/
if (fstat(i, &sbuf) >= 0) {
fp = (FILE *) fdopen(i,"r+"); /*guess mode*/
if (fp) {
strcpy(files[idnum].mode, "r+");
} else {
fp = (FILE *) fdopen(i, "r");
if (fp) {
strcpy(files[idnum].mode, "r");
files[idnum].writing = FALSE;
} else {
fp = (FILE *) fdopen(i, "w");
if (fp) {
strcpy(files[idnum].mode, "w");
files[idnum].reading = FALSE;
}
else
continue;
}
}
tname = (char *)malloc(sizeof("descriptor[19]"));
if (tname == NULL) {
math_error("Out of memory for init_file");
/*NOTREACHED*/
}
sprintf(tname, "descriptor[%d]", i);
files[idnum].name = tname;
files[idnum].id = idnum;
files[idnum].fp = fp;
files[idnum].dev = sbuf.st_dev;
files[idnum].inode = sbuf.st_ino;
ioindex[idnum] = idnum;
idnum++;
lastid++;
}
}
done = 1;
}
}
/*
* init_fileio - initialize a FILEIO structure
*
* This function initializes a calc FILEIO structure. It will optionally
* malloc the filename string if given an non-NULL associated filename.
* It will canonicalize the file open mode string.
*
* given:
* fiop pointer to FILEIO structure to initialize
* name associated filename (NULL => caller will setup filename)
* mode open mode (one of {r,w,a}{,b}{,+})
* sbufp pointer to stat of open file
* id calc file ID
* fp open file stream
*/
S_FUNC void
init_fileio(FILEIO *fiop, char *name, char *mode,
struct stat *sbufp, FILEID id, FILE *fp)
{
char modestr[sizeof(fiop->mode)]; /* mode [rwa]b?\+? */
size_t namelen; /* length of name */
/* allocate filename if requested */
if (name != NULL) {
namelen = strlen(name);
fiop->name = (char *)malloc(namelen + 1);
if (fiop->name == NULL) {
math_error("No memory for filename");
/*NOTREACHED*/
}
}
/* initialize FILEIO structure */
if (name != NULL) {
strncpy(fiop->name, name, namelen+1);
}
fiop->id = id;
fiop->fp = fp;
fiop->dev = sbufp->st_dev;
fiop->inode = sbufp->st_ino;
fiop->reading = FALSE;
fiop->writing = FALSE;
fiop->appending = FALSE;
fiop->binary = FALSE;
fiop->action = 0;
fiop->mode[0] = '\0';
/*
* determine file open mode
*
* While a leading 'r' is for reading and a leading 'w' is
* for writing, the presense of a '+' in the string means
* both reading and writing. A leading 'a' means append
* which is writing.
*/
/* canonicalize read modes */
if (mode[0] == 'r') {
/* note read mode */
strcpy(modestr, "r");
fiop->reading = TRUE;
/* note binary mode even though mode is not used / ignored */
if (strchr(mode, 'b') != NULL) {
strcat(modestr, "b");
}
/* note if reading and writing */
if (strchr(mode, '+') != NULL) {
fiop->writing = TRUE;
strcat(modestr, "+");
}
/* canonicalize write modes */
} else if (mode[0] == 'w') {
/* note write mode */
strcpy(modestr, "w");
fiop->writing = TRUE;
/* note binary mode even though mode is not used / ignored */
if (strchr(mode, 'b') != NULL) {
strcat(modestr, "b");
}
/* note if reading and writing */
if (strchr(mode, '+') != NULL) {
fiop->reading = TRUE;
strcat(modestr, "+");
}
/* canonicalize append modes */
} else if (mode[0] == 'a') {
/* note append mode */
strcpy(modestr, "a");
fiop->writing = TRUE;
fiop->appending = TRUE;
/* note binary mode even though mode is not used / ignored */
if (strchr(mode, 'b') != NULL) {
strcat(modestr, "b");
}
/* note if reading and writing */
if (strchr(mode, '+') != NULL) {
fiop->reading = TRUE;
strcat(modestr, "+");
}
/* canonicalize no I/O modes */
} else {
modestr[0] = '\0';
}
modestr[sizeof(modestr)-1] = '\0'; /* firewall */
/* record canonical open mode string */
strncpy(fiop->mode, modestr, sizeof(fiop->mode));
}
/*
* openid - open the specified file name for reading or writing
*
* given:
* name file name
* mode open mode (one of {r,w,a}{,b}{,+})
*
* returns:
* >=3 FILEID which can be used to do I/O to the file
* <0 if the open failed
*
* NOTE: This function will not return 0, 1 or 2 since they are
* reserved for stdin, stdout, stderr. In fact, it must not
* return 0, 1, or 2 because it will confuse those who call
* the opensearchfiile() function
*/
FILEID
openid(char *name, char *mode)
{
FILEIO *fiop; /* file structure */
FILEID id; /* new file id */
FILE *fp;
struct stat sbuf; /* file status */
int i;
/* find the next open slot in the files array */
if (idnum >= MAXFILES)
return -E_MANYOPEN;
fiop = &files[3];
for (i = 3; i < MAXFILES; fiop++,i++) {
if (fiop->name == NULL)
break;
}
if (i == MAXFILES)
math_error("This should not happen in openid()!!!");
/* open the file */
fp = f_open(name, mode);
if (fp == NULL) {
return FILEID_NONE;
}
if (fstat(fileno(fp), &sbuf) < 0) {
math_error("bad fstat");
/*NOTREACHED*/
}
/* get a new FILEID */
id = ++lastid;
ioindex[idnum++] = i;
/* initialize FILEIO structure */
init_fileio(fiop, name, mode, &sbuf, id, fp);
/* return calc open file ID */
return id;
}
/*
* openpathid - open the specified abse filename, or
* relative filename along a search path
*
* given:
* name file name
* mode open mode (one of {r,w,a}{,b}{,+})
* pathlist list of colon separated paths (or NULL)
*
* returns:
* >=3 FILEID which can be used to do I/O to the file
* <0 if the open failed
*
* NOTE: This function will not return 0, 1 or 2 since they are
* reserved for stdin, stdout, stderr. In fact, it must not
* return 0, 1, or 2 because it will confuse those who call
* the opensearchfiile() function
*/
FILEID
openpathid(char *name, char *mode, char *pathlist)
{
FILEIO *fiop; /* file structure */
FILEID id; /* new file id */
FILE *fp;
struct stat sbuf; /* file status */
char *openpath; /* malloc copy of path that was opened */
int i;
/* find the next open slot in the files array */
if (idnum >= MAXFILES)
return -E_MANYOPEN;
fiop = &files[3];
for (i = 3; i < MAXFILES; fiop++,i++) {
if (fiop->name == NULL)
break;
}
if (i == MAXFILES)
math_error("This should not happen in openpathid()!!!");
/* open a file - searching along a path */
openpath = NULL;
fp = f_pathopen(name, mode, pathlist, &openpath);
if (fp == NULL) {
if (openpath != NULL) {
/* should not happen, but just in case */
free(openpath);
}
return FILEID_NONE;
}
if (fstat(fileno(fp), &sbuf) < 0) {
if (openpath != NULL) {
free(openpath);
}
math_error("bad fstat");
/*NOTREACHED*/
}
if (openpath == NULL) {
fclose(fp);
math_error("bad openpath");
/*NOTREACHED*/
}
/* get a new FILEID */
id = ++lastid;
ioindex[idnum++] = i;
/* initialize FILEIO structure */
init_fileio(fiop, NULL, mode, &sbuf, id, fp);
fiop->name = openpath; /* already malloced by f_pathopen */
/* return calc open file ID */
return id;
}
/*
* reopenid - reopen a FILEID
*
* given:
* id FILEID to reopen
* mode new mode to open as
* mode new mode to open as (one of "r", "w", "a", "r+", "w+", "a+")
* name name of new file
*
* returns:
* FILEID which can be used to do I/O to the file
* <0 if the open failed
*/
FILEID
reopenid(FILEID id, char *mode, char *name)
{
FILEIO *fiop; /* file structure */
FILE *fp;
struct stat sbuf;
int i;
/* firewall */
if ((id == FILEID_STDIN) || (id == FILEID_STDOUT) ||
(id == FILEID_STDERR)) {
math_error("Cannot freopen stdin, stdout, or stderr");
/*NOTREACHED*/
}
/* reopen the file */
fiop = NULL;
for (i = 3; i < idnum; i++) {
fiop = &files[ioindex[i]];
if (fiop->id == id)
break;
}
if (i == idnum) {
if (name == NULL) {
fprintf(stderr, "File not open, need file name\n");
return FILEID_NONE;
}
if (idnum >= MAXFILES) {
fprintf(stderr, "Too many open files\n");
return FILEID_NONE;
}
for (fiop = &files[3], i = 3; i < MAXFILES; fiop++, i++) {
if (fiop->name == NULL)
break;
}
if (i >= MAXFILES) {
math_error("This should not happen in reopenid");
/*NOTREACHED*/
}
fp = f_open(name, mode);
if (fp == NULL) {
fprintf(stderr, "Cannot open file\n");
return FILEID_NONE;
}
ioindex[idnum++] = i;
fiop->id = id;
} else {
if (name == NULL)
fp = freopen(fiop->name, mode, fiop->fp);
else
fp = freopen(name, mode, fiop->fp);
if (fp == NULL) {
free(fiop->name);
fiop->name = NULL;
idnum--;
for (; i < idnum; i++)
ioindex[i] = ioindex[i + 1];
return FILEID_NONE;
}
}
if (fstat(fileno(fp), &sbuf) < 0) {
math_error("bad fstat");
/*NOTREACHED*/
}
/* initialize FILEIO structure */
if (name == NULL) {
if (fiop->name == NULL) {
math_error("old and new reopen filenames are NULL");
}
} else if (fiop->name != NULL) {
free(fiop->name);
fiop->name = NULL;
}
init_fileio(fiop, name, mode, &sbuf, id, fp);
/* return calc open file ID */
return id;
}
/*
* Find the file I/O structure for the specified file id, and verifies that
* it is opened in the required manner (0 for reading or 1 for writing).
* If writable is -1, then no open checks are made at all and NULL is then
* returned if the id represents a closed file.
*/
FILEIO *
findid(FILEID id, int writable)
{
FILEIO *fiop; /* file structure */
int i;
fiop = NULL;
if ((id < 0) || (id > lastid))
return NULL;
for (i = 0; i < idnum; i++) {
fiop = &files[ioindex[i]];
if (fiop->id == id)
break;
}
if (i == idnum)
return NULL;
if (writable >= 0) {
if ((writable && !fiop->writing) ||
(!writable && !fiop->reading)) {
return NULL;
}
}
return fiop;
}
/*
* Return whether or not a file id is valid. This is used for if tests.
*/
BOOL
validid(FILEID id)
{
return (findid(id, -1) != NULL);
}
/*
* Return the file with id = index if this is the id of a file that has been
* opened (it may have since been closed). Otherwise returns FILEID_NONE.
*/
FILEID
indexid(long index)
{
FILEID id;
id = (FILEID) index;
if ((index < 0) || (id > lastid))
return FILEID_NONE;
return id;
}
/*
* Close the specified file id. Returns TRUE if there was an error.
* Closing of stdin, stdout, or stderr is illegal, but closing of already
* closed files is allowed.
*/
int
closeid(FILEID id)
{
FILEIO *fiop; /* file structure */
int i;
int err;
fiop = NULL;
/* firewall */
if ((id == FILEID_STDIN) || (id == FILEID_STDOUT) ||
(id == FILEID_STDERR)) {
math_error("Cannot close stdin, stdout, or stderr");
/*NOTREACHED*/
}
/* get file structure */
for (i = 3; i < idnum; i++) {
fiop = &files[ioindex[i]];
if (fiop->id == id)
break;
}
if (i == idnum)
return 1; /* File not open */
idnum--;
for (; i < idnum; i++)
ioindex[i] = ioindex[i + 1];
free(fiop->name);
fiop->name = NULL;
/* close file and note error state */
err = ferror(fiop->fp);
err |= fclose(fiop->fp);
fiop->fp = NULL;
/* return success or failure */
return (err ? EOF : 0);
}
int
closeall(void)
{
FILEIO *fiop;
int i;
int err;
err = 0;
for (i = 3; i < idnum; i++) {
fiop = &files[ioindex[i]];
if (fiop->fp) {
free(fiop->name);
fiop->name = NULL;
err |= fclose(fiop->fp);
}
}
idnum = 3;
return err;
}
/*
* Return whether or not an error occurred to a file.
*/
BOOL
errorid(FILEID id)
{
FILEIO *fiop; /* file structure */
fiop = findid(id, -1);
if (fiop == NULL)
return EOF;
return (ferror(fiop->fp) != 0);
}
/*
* Return whether or not end of file occurred to a file.
*/
BOOL
eofid(FILEID id)
{
FILEIO *fiop; /* file structure */
fiop = findid(id, -1);
if (fiop == NULL)
return EOF;
return (feof(fiop->fp) != 0);
}
/*
* Flush output to an opened file.
*/
int
flushid(FILEID id)
{
FILEIO *fiop; /* file structure */
fiop = findid(id, -1);
if (fiop == NULL)
return 0;
if (!fiop->writing || fiop->action == 'r')
return 0;
return fflush(fiop->fp);
}
#if !defined(_WIN32)
int
flushall(void)
{
FILEIO *fiop;
int i;
int err;
err = 0;
for (i = 3; i < idnum; i++) {
fiop = &files[ioindex[i]];
if (fiop->writing && fiop->action != 'r')
err |= fflush(fiop->fp);
}
return err;
}
#endif /* Windoz free systems */
/*
* Read the next line, string or word from an opened file.
* Returns a pointer to an allocated string holding a null-terminated
* or newline terminated string. Where reading stops is controlled by
* flags:
*
* bit 0: at newline
* bit 1: at null character
* bit 2: at white space (also skips leading white space)
*
* If neither '\n' nor '\0' is encountered reading continues until EOF.
* If bit 3 is set the stop character is removed.
*
* given:
* id file to read from
* flags read flags (see above)
* retstr returned pointer to string
*/
int
readid(FILEID id, int flags, STRING **retstr)
{
FILEIO *fiop; /* file structure */
FILE *fp;
char *str; /* current string */
unsigned long n; /* current number characters read into buf */
unsigned long totlen; /* total length of string copied from buf */
char buf[READSIZE]; /* temporary buffer */
char *b;
int c;
BOOL nlstop, nullstop, wsstop, rmstop, done;
FILEPOS fpos;
STRING *newstr;
totlen = 0;
str = NULL;
fiop = findid(id, FALSE);
if (fiop == NULL)
return 1;
nlstop = (flags & 1);
nullstop = (flags & 2);
wsstop = (flags & 4);
rmstop = (flags & 8);
fp = fiop->fp;
if (fiop->action == 'w') {
f_tell(fp, &fpos);
fflush(fp);
if (f_seek_set(fp, &fpos) < 0)
return 3;
}
fiop->action = 'r';
if (wsstop) {
while (isspace(c = fgetc(fp)));
ungetc(c, fp);
}
for (;;) {
b = buf;
n = 0;
do {
c = fgetc(fp);
if (c == EOF)
break;
n++;
if (nlstop && c == '\n')
break;
if (nullstop && c == '\0')
break;
if (wsstop && isspace(c))
break;
*b++ = c;
} while (n < READSIZE);
done = ((nlstop && c == '\n') || (nullstop && c == '\0') ||
(wsstop && isspace(c)) || c == EOF);
if (done && rmstop && c != EOF)
n--;
if (totlen)
str = (char *)realloc(str, totlen + n + 1);
else
str = (char *)malloc(n + 1);
if (str == NULL) {
math_error("Out of memory for readid");
/*NOTREACHED*/
}
if (n > 0)
memcpy(&str[totlen], buf, n);
totlen += n;
if (done)
break;
}
if (totlen == 0 && c == EOF) {
free(str);
return EOF;
}
if ((nlstop && c == '\n') && !rmstop)
str[totlen - 1] = '\n';
if ((nullstop && c == '\0') && !rmstop)
str[totlen - 1] = '\0';
str[totlen] = '\0';
newstr = stralloc();
newstr->s_len = totlen;
newstr->s_str = str;
*retstr = newstr;
return 0;
}
/*
* Return the next character from an opened file.
* Returns EOF if there was an error or end of file.
*/
int
getcharid(FILEID id)
{
FILEIO *fiop;
FILEPOS fpos;
fiop = findid(id, FALSE);
if (fiop == NULL)
return -2;
if (fiop->action == 'w') {
f_tell(fiop->fp, &fpos);
fflush(fiop->fp);
if (f_seek_set(fiop->fp, &fpos) < 0)
return -3;
}
fiop->action = 'r';
return fgetc(fiop->fp);
}
/*
* Print out the name of an opened file.
* If the file has been closed, a null name is printed.
* If flags contain PRINT_UNAMBIG then extra information is printed
* identifying the output as a file and some data about it.
*/
int
printid(FILEID id, int flags)
{
FILEIO *fiop; /* file structure */
FILE *fp;
ZVALUE pos; /* file position */
/*
* filewall - file is closed
*/
fiop = findid(id, -1);
if (fiop == NULL) {
if (flags & PRINT_UNAMBIG)
math_fmt("FILE %ld closed", id);
else
math_str("\"\"");
return 1;
}
/*
* print quoted filename and mode
*/
if ((flags & PRINT_UNAMBIG) == 0) {
math_chr('"');
math_str(fiop->name);
math_chr('"');
return 0;
}
math_fmt("FILE %ld \"%s\" (%s", id, fiop->name, fiop->mode);
/*
* print file position
*/
fp = fiop->fp;
if (get_open_pos(fp, &pos) < 0) {
if (fileno(fp) > 2)
math_str("Error while determining file position!");
math_chr(')');
return 0;
}
math_str(", pos ");
zprintval(pos, 0, 0);
zfree(pos);
/*
* report special status
*/
if (ferror(fp))
math_str(", error");
if (feof(fp))
math_str(", eof");
math_chr(')');
printf(" fileno: %d ", fileno(fp));
return 0;
}
/*
* Print a formatted string similar to printf. Various formats of output
* are possible, depending on the format string AND the actual types of the
* values. Mismatches do not cause errors, instead something reasonable is
* printed instead. The output goes to the file with the specified id.
*
* given:
* id file id to print to
* count print count
* fmt standard format string
* vals table of values to print
*/
int
idprintf(FILEID id, char *fmt, int count, VALUE **vals)
{
FILEIO *fiop;
VALUE *vp;
char *str;
int ch;
size_t len;
int oldmode, newmode;
long olddigits, newdigits;
long width, precision;
BOOL didneg, didprecision;
FILEPOS fpos;
BOOL printstring;
BOOL printchar;
fiop = findid(id, TRUE);
if (fiop == NULL)
return 1;
if (fiop->action == 'r') {
f_tell(fiop->fp, &fpos);
if (f_seek_set(fiop->fp, &fpos) < 0)
return 3;
}
fiop->action = 'w';
printstring = FALSE;
printchar = FALSE;
math_setfp(fiop->fp);
while ((ch = *fmt++) != '\0') {
if (ch != '%') {
math_chr(ch);
continue;
}
/*
* Here to handle formats.
*/
didneg = FALSE;
didprecision = FALSE;
width = 0;
precision = 0;
ch = *fmt++;
if (ch == '-') {
didneg = TRUE;
ch = *fmt++;
}
while ((ch >= '0') && (ch <= '9')) {
width = width * 10 + (ch - '0');
ch = *fmt++;
}
if (ch == '.') {
didprecision = TRUE;