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If for some reason it is difficult or unworkable to integrate configuration
file processing with command line option parsing, the libopts
(see section libopts External Procedures) library can still be used to process configuration
files. Below is a "Hello, World!" greeting program that tries
to load a configuration file `hello.conf' to see if it should use
an alternate greeting or to personalize the salutation.
#include <sys/types.h>
#include <stdio.h>
#include <pwd.h>
#include <string.h>
#include <unistd.h>
#include <autoopts/options.h>
int main( int argc, char** argv ) {
char const* greeting = "Hello";
char const* greeted = "World";
const tOptionValue* pOV = configFileLoad( "hello.conf" );
if (pOV != NULL) {
const tOptionValue* pGetV = optionGetValue( pOV, "greeting" );
if ( (pGetV != NULL)
&& (pGetV->valType == OPARG_TYPE_STRING))
greeting = strdup( pGetV->v.strVal );
pGetV = optionGetValue( pOV, "personalize" );
if (pGetV != NULL) {
struct passwd* pwe = getpwuid( getuid() );
if (pwe != NULL)
greeted = strdup( pwe->pw_gecos );
}
optionUnloadNested( pOV ); /* deallocate config data */
}
printf( "%s, %s!\n", greeting, greeted );
return 0;
}
|
With that text in a file named "hello.c", this short script:
cc -o hello hello.c `autoopts-config cflags ldflags` ./hello echo 'greeting Buzz off' > hello.conf ./hello echo personalize > hello.conf ./hello |
will produce the following output (for me):
Hello, World! Buzz off, World! Hello, Bruce Korb! |
This document was generated by Bruce Korb on September, 30 2006 using texi2html 1.76.