Karl was right: realpath() is pretty much what I wanted:
#include <stdio.h>
#include <string.h>
/*
* ----------------------------------------------------------------------------
* Read lines from stdin, assume they're pathnames, attempt
* to convert them to their "canonical" form, print canonical
* version if successful else just echo unconverted input.
*/
int
main(
int argc,
char **argv )
{
char pathname[ 102400 ];
char canonical[ 102400 ];
char *ptr;
while( fgets( pathname, (sizeof( pathname ) - 1), stdin ) ) {
ptr = strchr( pathname, '\n' );
if( ptr ) {
*ptr = 0;
}
if( realpath( pathname, canonical ) ) {
ptr = canonical;
} else {
ptr = pathname;
}
printf( "%s\n", ptr );
}
return( 0 );
}
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