filenames.h

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/*
 * Utility functions and macros for working with file names.
 *
 * Trying to be platform-independent.
 *
 *
 * Created by MacBook on 21.01.2025.
 */
 
#ifndef CLIBS_FILENAMES_H
#define CLIBS_FILENAMES_H
 
#include "attributes.h"
 
#include <stdbool.h> /* bool */
#include <string.h>  /* strrchr */
 
#ifndef __FILE_NAME__
#define __FILE_NAME__ \
    ( strrchr( __FILE__, '/' ) ? strrchr( __FILE__, '/' ) + 1 : __FILE__ )
#endif //__FILE_NAME__
 
 
#ifndef PATH_MAX
#if defined( __APPLE__ ) // Get PATH_MAX
#include <sys/syslimits.h>
#elif defined( __linux__ )
#include <linux/limits.h>
#else
#define PATH_MAX 4096
#endif
#endif //ndef PATH_MAX

LibraryDefined char ProgName[ PATH_MAX + 1 ] = "current-program";

LibraryDefined const char *get_file_name( const char *const full_path )
{
    const char *last_slash = strrchr( full_path, '/' );
    if ( last_slash == NULL )
        return full_path;
 
    if ( *( last_slash + 1 ) != '\0' )
        return last_slash + 1;
 
    /* path ends with '/' -> return the name before if present */
    for ( const char *ptr = last_slash - 1; ptr >= full_path; --ptr )
        if ( *ptr == '/' )
            return ptr + 1;
 
    return full_path;
}

LibraryDefined inline const char *get_prog_name( void )
{
    return ProgName;
}

BeforeMain LibraryDefined bool set_prog_name( void );
 
 
#if defined( __APPLE__ ) /* not sure if it actually works on iPhones :D */
#include <err.h>         /* warn */
#include <mach-o/dyld.h> /* _NSGetExecutablePath() */
#include <stdlib.h>      /* malloc */
 
BeforeMain LibraryDefined bool set_prog_name( void )
{
    char path[ PATH_MAX + 1 ];
    uint32_t size = sizeof path;
    if ( _NSGetExecutablePath( path, &size ) != 0 )
    {
        char *const alloced = malloc( size );
        if ( alloced == NULL || _NSGetExecutablePath( path, &size ) != 0 )
        {
            warn( "not able to initialize prog name" ); // use std warn to avoid circular import
            return false;
        }
        const char *name = get_file_name( path );
        strncpy( ProgName, name, size );
        free( alloced );
        return true;
    }
    const char *name = get_file_name( path );
    strncpy( ProgName, name, PATH_MAX );
    return true;
}
 
#elif defined( __linux__ )
#include <unistd.h> /* readlink */
 
BeforeMain LibraryDefined bool set_prog_name( void )
{
    char path[ PATH_MAX ] = { 0 };
 
    if ( readlink( "/proc/self/exe", path, PATH_MAX ) == -1 )
        return true;
 
    strncpy( ProgName, get_file_name( path ), PATH_MAX );
    return false;
}
 
#endif // set_prog_name()
 
 
#endif //CLIBS_FILENAMES_H