Hi,
i want to save the keywords of an ini file in a struct, together with a
fpos_t. I think iīm right with the concept, but the access through fsetpos()
doesnīt work. The position is always wrong (except, in this example, the
first line).
My struct looks like this:
***
typedef struct {
char pname[32];
fpos_t pos;
} iniParam;
This routine reads the data and put it to "iniParam param[100]":
***
while (!feof (pFile)) {
fgetpos(pFile, &pos);
c=fgetc(pFile);
ungetc(c, pFile);
if(c == '#')
fgets (linebuf, 255, pFile);
else {
param[i].pos = pos;
fgets (linebuf, 255, pFile);
sscanf(linebuf, "%s", param[i].pname);
i++;
}
}
This routine reads the keywords and do a corresponding fscanf:
***
for(i=0; i<n; i++) {
if(strcmp(param[i].pname, "keyword1") == 0) {
pos = param[i].pos;
fsetpos(pFile, &pos);
fscanf(pFile, "%*s %d", ¶m1);
}
if(strcmp(param[i].pname, "keyword2") == 0) {
...
Donīt know why the access through a fpos_t position doesnīt work.
Thanks for any help, Chris 11 7465
On Wed, 8 Oct 2003 03:26:26 +0200, "C. Sengstock" <sp**@sucks.com>
wrote: Hi, i want to save the keywords of an ini file in a struct, together with a fpos_t. I think iīm right with the concept, but the access through fsetpos() doesnīt work. The position is always wrong (except, in this example, the first line).
It works for me with just two problems. The reading loop doesn't
detect end of file correctly as explained in the faq: http://www.eskimo.com/~scs/C-faq/q12.2.html
Also blank lines and junk lines in the ini file result in invalid
entries in param[].
My advice is:
1. Check the return code of each library functions you call.
2. Post a complete but minimalist program, including the ini
file contents that demonstrate the problem.
My struct looks like this: *** typedef struct { char pname[32]; fpos_t pos; } iniParam;
This routine reads the data and put it to "iniParam param[100]": *** while (!feof (pFile)) { fgetpos(pFile, &pos); c=fgetc(pFile); ungetc(c, pFile); if(c == '#') fgets (linebuf, 255, pFile); else { param[i].pos = pos; fgets (linebuf, 255, pFile); sscanf(linebuf, "%s", param[i].pname); i++; } }
This routine reads the keywords and do a corresponding fscanf: *** for(i=0; i<n; i++) { if(strcmp(param[i].pname, "keyword1") == 0) { pos = param[i].pos; fsetpos(pFile, &pos); fscanf(pFile, "%*s %d", ¶m1); } if(strcmp(param[i].pname, "keyword2") == 0) { ...
Donīt know why the access through a fpos_t position doesnīt work. Thanks for any help, Chris
Nick.
about http://www.eskimo.com/~scs/C-faq/q12.2.html
u can
while(fgets(buf, MAXLINE, infp) != NULL && !feof(infp))
{
}
"Nick Austin" <ni**********@nildram.co.uk> wrote in message
news:r3********************************@4ax.com... On Wed, 8 Oct 2003 03:26:26 +0200, "C. Sengstock" <sp**@sucks.com> wrote:
Hi, i want to save the keywords of an ini file in a struct, together with a fpos_t. I think iīm right with the concept, but the access through
fsetpos()doesnīt work. The position is always wrong (except, in this example, the first line).
It works for me with just two problems. The reading loop doesn't detect end of file correctly as explained in the faq:
http://www.eskimo.com/~scs/C-faq/q12.2.html
Also blank lines and junk lines in the ini file result in invalid entries in param[].
My advice is: 1. Check the return code of each library functions you call. 2. Post a complete but minimalist program, including the ini file contents that demonstrate the problem.
My struct looks like this: *** typedef struct { char pname[32]; fpos_t pos; } iniParam;
This routine reads the data and put it to "iniParam param[100]": *** while (!feof (pFile)) { fgetpos(pFile, &pos); c=fgetc(pFile); ungetc(c, pFile); if(c == '#') fgets (linebuf, 255, pFile); else { param[i].pos = pos; fgets (linebuf, 255, pFile); sscanf(linebuf, "%s", param[i].pname); i++; } }
This routine reads the keywords and do a corresponding fscanf: *** for(i=0; i<n; i++) { if(strcmp(param[i].pname, "keyword1") == 0) { pos = param[i].pos; fsetpos(pFile, &pos); fscanf(pFile, "%*s %d", ¶m1); } if(strcmp(param[i].pname, "keyword2") == 0) { ...
Donīt know why the access through a fpos_t position doesnīt work. Thanks for any help, Chris
Nick.
"Nick Austin" wrote: My advice is: 1. Check the return code of each library functions you call. 2. Post a complete but minimalist program, including the ini file contents that demonstrate the problem.
This is straighter to the point. The code should save the position of a
line, and do the output through that positions. But the code doesnīt work,
the output is:
-----------------------------
#dontreadthis <<< this is the "myfile.txt" data
baud = 4
#nodata
port = 50
parity = 6
<<< till here
*** output
#dontreadthis <<<< thatīs the generated output through positions
this
= 4
ta
<<<< thatīs the end
------------------------------------
the code looks like this:
-------------------------------------
fpos_t position[50];
FILE* fp;
char line[200];
int i, n;
fp = fopen("myfile.txt", "r");
if(!fp) perror("error opening file");
else {
i=0;
while(!feof(fp)) {
if(fgetpos(fp, &position[i]) != 0) {
printf("error getting position\n");
exit(1);
}
if(fgets(line, 200, fp)==NULL)
break;
printf("%s", line);
i++;
}
}
n=i;
printf("\n*** output\n");
for(i=0; i<n; i++) {
if(fsetpos(fp, &position[i]) != 0) {
printf("error setting position\n");
exit(1);
}
fgets(line, 200, fp);
printf("%s", line);
}
fclose(fp);
-----------------------------------------
Thanks, Chris
"C. Sengstock" wrote: "Nick Austin" wrote:
My advice is: 1. Check the return code of each library functions you call. 2. Post a complete but minimalist program, including the ini file contents that demonstrate the problem.
This is straighter to the point. The code should save the position of a line, and do the output through that positions. But the code doesnīt work, the output is:
.... snip ...
All complete C programs include an "int main(...) {" line, and
code cannot be generated outside of a function, which, in turn,
usually requires some sort of return statement.
Try again, with something that can be cut, pasted and compiled
unchanged. Do include the sample data again - you did that right.
--
Chuck F (cb********@yahoo.com) (cb********@worldnet.att.net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home.att.net> USE worldnet address!
On Wed, 8 Oct 2003 14:19:49 +0200, "C. Sengstock" <sp**@sucks.com>
wrote: This is straighter to the point. The code should save the position of a line, and do the output through that positions. But the code doesnīt work, the output is: ----------------------------- #dontreadthis <<< this is the "myfile.txt" data baud = 4 #nodata
port = 50 parity = 6 <<< till here *** output #dontreadthis <<<< thatīs the generated output through positions this = 4 ta <<<< thatīs the end ------------------------------------
When I try the output is:
#dontreadthis
baud = 4
#nodata
port = 50
parity = 6
*** output
#dontreadthis
baud = 4
#nodata
port = 50
parity = 6
So the problem isn't in the code snippet you posted. You could
try asking again in a newsgroup for you compiler.
the code looks like this:
#include <stdio.h>
int main( void )
{ fpos_t position[50]; FILE* fp; char line[200]; int i, n;
fp = fopen("myfile.txt", "r"); if(!fp) perror("error opening file"); else { i=0; while(!feof(fp)) { if(fgetpos(fp, &position[i]) != 0) { printf("error getting position\n"); exit(1); } if(fgets(line, 200, fp)==NULL) break; printf("%s", line); i++; } } n=i; printf("\n*** output\n"); for(i=0; i<n; i++) { if(fsetpos(fp, &position[i]) != 0) { printf("error setting position\n"); exit(1); } fgets(line, 200, fp); printf("%s", line); } fclose(fp);
return 0;
}
Nick.
"CBFalconer" wrote: All complete C programs include an "int main(...) {" line, and code cannot be generated outside of a function, which, in turn, usually requires some sort of return statement.
Yep ... copy paste ready cody ...
#include<stdio.h>
#include<stdlib.h>
int main() {
fpos_t position[50];
FILE* fp;
char line[200];
int i, n;
fp = fopen("myfile.txt", "r");
if(!fp) perror("error opening file");
else {
i=0;
while(!feof(fp)) {
if(fgetpos(fp, &position[i]) != 0) {
printf("error getting position\n");
exit(1);
}
if(fgets(line, 200, fp)==NULL)
break;
printf("%s", line);
i++;
}
}
n=i;
printf("\n*** output\n");
for(i=0; i<n; i++) {
if(fsetpos(fp, &position[i]) != 0) {
printf("error setting position\n");
exit(1);
}
fgets(line, 200, fp);
printf("%s", line);
}
fclose(fp);
return 0;
}
Thanks, Chris
in comp.lang.c i read: while(fgets(buf, MAXLINE, infp) != NULL && !feof(infp))
the feof test is redundant.
--
a signature
C. Sengstock wrote: "CBFalconer" wrote: All complete C programs include an "int main(...) {" line, and code cannot be generated outside of a function, which, in turn, usually requires some sort of return statement. Yep ... copy paste ready cody ...
#include<stdio.h> #include<stdlib.h> int main() { fpos_t position[50]; FILE* fp; char line[200]; int i, n;
fp = fopen("myfile.txt", "r"); if(!fp) perror("error opening file");
You most probably want to exit as well at this point (or atleast avoid
reading from fp later on down below, by initializing i to 0).
else { i=0; while(!feof(fp)) { if(fgetpos(fp, &position[i]) != 0) { printf("error getting position\n"); exit(1);
exit(EXIT_FAILURE);
} if(fgets(line, 200, fp)==NULL)
I would personally prefer to use sizeof(line) instead in this case.
break; printf("%s", line); i++; } } n=i; printf("\n*** output\n"); for(i=0; i<n; i++) { if(fsetpos(fp, &position[i]) != 0) { printf("error setting position\n"); exit(1);
exit(EXIT_FAILURE); } fgets(line, 200, fp);
See above.
printf("%s", line); } fclose(fp); return 0; }
Thanks, Chris
What exactly is the problem you are encountering with this code? Are you
100% certain that none of your lines are more than 200 characters in
length?
-nrk.
"nrk" wrote: What exactly is the problem you are encountering with this code? Are you 100% certain that none of your lines are more than 200 characters in length?
Yep, size of line isnīt greater than 200. I really think the problem has to
do with the compiler (tcc or bcc32, both make this failure!). I tried a lot
of tests with fgetpos() and fsetpos(), but they all went wrong!
Chris
"C. Sengstock" wrote: "CBFalconer" wrote:
All complete C programs include an "int main(...) {" line, and code cannot be generated outside of a function, which, in turn, usually requires some sort of return statement. Yep ... copy paste ready cody ...
#include<stdio.h> #include<stdlib.h> int main() {
int main(void) is better, but only a nit.
fpos_t position[50]; FILE* fp; char line[200]; int i, n;
fp = fopen("myfile.txt", "r"); if(!fp) perror("error opening file");
here, after detecting the error, you continue with the output.
This term should contain an exit(EXIT_FAILURE); statement.
else { i=0; while(!feof(fp)) { if(fgetpos(fp, &position[i]) != 0) { printf("error getting position\n"); exit(1); } if(fgets(line, 200, fp)==NULL) break; printf("%s", line); i++; } } n=i; printf("\n*** output\n"); for(i=0; i<n; i++) { if(fsetpos(fp, &position[i]) != 0) { printf("error setting position\n"); exit(1); } fgets(line, 200, fp); printf("%s", line); } fclose(fp); return 0; }
Now I pretty well have to look at it. :-) So I took your message,
snipped off the beginning and end, and:
[1] c:\c\junk>gcc -o fpos.exe fpos.c
[1] c:\c\junk>type fpostst.txt
#dontreadthis
baud = 4
#nodata
port = 50
parity = 6
[1] c:\c\junk>fpos
#dontreadthis
baud = 4
#nodata
port = 50
parity = 6
*** output
#dontreadthis
baud = 4
#nodata
port = 50
parity = 6
This is the results here, after changing the input file name. It
seems to do what you wanted, so you should look to your system.
Now you see how much easier it is for people to help if you give
them something to work with. I could criticise the lack of blanks
around tokens, but I won't :-)
One thought strikes me - does your test file have its last line
properly terminated with a \n? If not the funny termination
conditions might be causing the problem.
Of course the reread tells you nothing, since it is done in
sequence and thus the fsetpos doesn't have any work to do. Try
doing the reads in reverse order in the output section, i.e:
for (i = n-1; i >= 0; i--) {
--
Chuck F (cb********@yahoo.com) (cb********@worldnet.att.net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home.att.net> USE worldnet address!
In article <m1*************@usa.net>
those who know me have no need of my name <no****************@usa.net> wrote: in comp.lang.c i read:while(fgets(buf, MAXLINE, infp) != NULL && !feof(infp)) the feof test is redundant.
Actually, it is not redundant: it is wrong. :-)
If fgets() returns NULL, we know that getc(infp) -- or some equivalent
operation -- returned EOF, but there are *two* reasons that getc()
might return EOF. One is "end of file", which would also set the
EOF indicator on the stream, making the feof() call redundant in
this (usual) case. The other, however, is "error reading stream".
You might, for instance, have this occur when reading from a bad
floppy disk. In this case the EOF indicator is *not* set on the
stream. Instead, the error indicator -- the thing tested by
ferror(infp) -- is set.
Thus, when reading from a bad floppy, the loop:
while (fgets(buf, MAXLINE, infp) != NULL && !feof(infp))
may run forever, calling fgets(), getting NULL due to ferror(infp),
and then seeing that feof(infp) is still 0.
--
In-Real-Life: Chris Torek, Wind River Systems (BSD engineering)
Salt Lake City, UT, USA (40°39.22'N, 111°50.29'W) +1 801 277 2603
email: forget about it http://67.40.109.61/torek/index.html (for the moment)
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