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Full Discussion: Wierd C program. Help Needed
Top Forums Programming Wierd C program. Help Needed Post 302145422 by karthikb23 on Wednesday 14th of November 2007 05:47:51 AM
Old 11-14-2007
Well, on the above lines, i could further deduce:

1. in one case, k was pointing to stdout (dont know how!), coz its memory contents were that of my printf statement, prior to the sprintf. (Surprising!)

2. In one case, k was pointing to the string part of my sprintf statement. Hence again, it is not illegal, and the program would work. (Seems possible).

However, this kind of valid but garbage initializations seem to happen only when variable j is declared. Else, the program halts by SEGV.

But i still believe that this is a special and one-off case. Guess the same code would not work on another machine. (Mine is Solaris).

Any comments/inputs/further insight anyone?
 

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wsprintf(3C)						   Standard C Library Functions 					      wsprintf(3C)

NAME
wsprintf - formatted output conversion SYNOPSIS
#include <stdio.h> #include <widec.h> int wsprintf(wchar_t *s, const char *format, /* arg */ ... );); DESCRIPTION
The wsprintf() function outputs a Process Code string ending with a Process Code (wchar_t) null character. It is the user's responsibility to allocate enough space for this wchar_t string. This returns the number of Process Code characters (excluding the null terminator) that have been written. The conversion specifications and behavior of wsprintf() are the same as the regular sprintf(3C) function except that the result is a Process Code string for wsprintf(), and on Extended Unix Code (EUC) character string for sprintf(). RETURN VALUES
Upon successful completion, wsprintf() returns the number of characters printed. Otherwise, a negative value is returned. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------------------------------------+ |ATTRIBUTE TYPE ATTRIBUTE VALUE | |MT-Level MT-Safe | +-----------------------------------------------------------+ SEE ALSO
wsscanf(3C), printf(3C), scanf(3C), sprintf(3C), attributes(5) SunOS 5.11 29 Dec 1996 wsprintf(3C)
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