HPUX11 fgets() warning

[Marty Jorgenson]

Can some one shed some light on this problem for me.

While compling the following code on HPUX11 unix platform.

1 #include
2
3 void main()
4 {
5 FILE *infile;
6
7 static unsigned char buf[1024];
8
9 infile = fopen("test.txt", "r");
10
11 while (fgets(buf,80,infile) != NULL);
12 {
13 fputs(buf, stdout);
14 }
15 }

I get the following erros:

cc: "temp.c", line 11: warning 604: Pointers are not
assignment-compatible.
cc: "temp.c", line 11: warning 563: Argument #1 is not the correct type.
cc: "temp.c", line 13: warning 604: Pointers are not
assignment-compatible.
cc: "temp.c", line 13: warning 563: Argument #1 is not the correct type.

I went to HP site and check on the sytax for HPUX11 on fgets at:
http://devresource.hp.com/STKL/man/11.00/gets_3s.html
I can not see any problem with the code and it runs with no problems.


Thanks in advance for your help Marty

[Kenneth Platz]

Marty,

The fgets() and fputs() functions expect a pointer to a (signed) char, not a pointer to an unsigned char. This doesn't make much difference to your program, but is sufficient to cause the compiler to generate a warning. You can eliminate these warnings by changing your declaration of "buf" to:

static char buf[1024];

Incidentially, the program as you posted it will actually print nothing, because the line:

while( fgets( buf, 80, infile ) != NULL ) ;

will simply read all of the lines of the infile and do nothing with them. (Ie, you should remove the semicolon at the end of the line).

I hope this helps.