C (un-)efficiency…

Problem : having one file created on the current dir, want to create it on /tmp
Solution : prepend « /tmp/ » to the filename, without breaking some other code part…

Language 1 : Java, 10ms
    Before :
String filename;
… some code to calculate the filename …
File file = new File(filename);

    After :
String filename;
… some code to calculate the filename …
File file = new File("/tmp/" + filename); # Or better, new File("/tmp", filename) !

Langage 2 : C, 10min
    Before :
char filename[255];
… some code to calculate the filename …
FILE *file = fopen(filename, "rb");

    After :
char filename[255];
… some code to calculate the filename …
File *file = fopen(filename, "rb");
char tmp[255]; # Sniff, hardcoded length, and one useless variable :(…
strcat(tmp, "/tmp/");
strcat(tmp, filename);
strcpy(filename, tmp);
FILE *file = fopen(filename, "rb");

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