s(n)printf weird things happening...

[KneeLess]

Running code like this, weird things happen:

char SBD_FULL_PATH[1024];
/* a ways down */
printf("SFP1: %s\n",SBD_FULL_PATH);
snprintf(SBD_FULL_PATH,sizeof(SBD_FULL_PATH),
    "%s\\%s%s\"",SBD_FULL_PATH,argv[0],SBD_EXTENSION);
printf("SFP2: %s\n",SBD_FULL_PATH);
snprintf(SBD_FULL_PATH,sizeof(SBD_FULL_PATH),
    "\"%s",SBD_FULL_PATH);
printf("SFP3: %s\n",SBD_FULL_PATH);

Output:

SFP1: C:\folder
SFP2: C:\folder\file.txt"
SFP3: """""""""""""""""""

Is snprintf or _snprintf in Windows broken? (Yes, both functions output the same thing.) Using MinGW on Windows XP.

[Dante Shamest]

Can't see anything wrong, although one of your string literals has an extra \" at the end, which is producing this output:

SFP2: C:\folder\file.txt"

Is it possible for you to post the source code for a program that demonstrates the said problem? It would be easier for us to compile and test and see if snprintf is really broken.

[KneeLess]

Yes, I want to quote the string, so I broke what i was doing into parts.

#include <stdio.h>
#include <windows.h>

int main(int argc, char **argv)
{
	char str[1024];
	GetCurrentDirectory(sizeof(str),str);
	printf("Str1: %s\n",str);
	_snprintf(str,sizeof(str),"\"%s\\%s\"",str,argv[0]);
	printf("Str2: %s\n",str);
	return 0;
}

Sample output:

Str1: C:\folder
Str2: """"""""""\C:\folder\test.exe"

[Dante Shamest]

Well, perhaps your problem lies in using SBD_FULL_PATH as the output and input.

snprintf(SBD_FULL_PATH,sizeof(SBD_FULL_PATH),  "\"%s",SBD_FULL_PATH);

[KneeLess]

Yes, that's the problem, I wonder why that happens.

[Dante Shamest]

From the documentation

If copying occurs between strings that overlap, the behavior is undefined.

SBD_FULL_PATH definitely overlaps SBD_FULL_PATH.