[C] piping user input into system() call (or similar)

Hey guys,
I'm working on creating a C program I think will be really neat to use with linux and scp but I have run in to a roadblock.
I need to pass a statement to the system from my C program but with user defined variables, allow me to explain with an example:
#include <stdio.h>
int main()
gets (port);
gets (cypher);
system("scp", "-P" port, "-c" cypher);
return(0);
Now obviously (and sadly!) this doesn't work. Can anyone help me achieve this goal?
Regards,
Mike.
Last edited by DrMikeDuke (2009-10-12 23:01:18)

Fork and exec is probably the more common way of doing it, but from your example you probably want something like this (can't guarantee this will work but it should help):
#include <stdio.h>
int main()
char temp[256], port[32], cypher[32];
gets(port);
gets(cypher);
// This line uses formatted printing to insert variables into a string
sprintf(temp, "scp -P %i -c %s", atoi(port), cypher); // %i = int %s = string/char array
system(temp);
return 0;
the "atoi" part isn't actually necessary at all but is something to take a note of for future usage. It converts a string into an integer.
Last edited by HashBox (2009-10-13 04:56:41)

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[C] piping user input into system() call (or similar)

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