sys_getexepath.c

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/* get the executable path */

#include "../fb.h"

char *fb_hGetExePath( char *dst, ssize_t maxlen )
{
        char *p;
        ssize_t argv_len, len;

        argv_len = strlen( __fb_ctx.argv[0] );

        /* check for drive letter - if there, get full path from argv[0] */
        if( isalpha(__fb_ctx.argv[0][0]) && __fb_ctx.argv[0][1] == ':' )
        {
                len = argv_len;
                if( len >= maxlen)
                        return NULL;

                memcpy( dst, __fb_ctx.argv[0], len );
                dst[len] = '\0';
        }
        /* check for \ at beginning - get drive letter from cwd */
        else if( __fb_ctx.argv[0][0] == '\\' || __fb_ctx.argv[0][0] == '/' )
        {
                len = 1 + argv_len;
                if( len >= maxlen )
                        return NULL;

                dst[0] = __fb_startup_cwd[0];
                dst[1] = ':';
                memcpy( dst + 2, __fb_ctx.argv[0], argv_len );
                dst[len] = '\0';
        }
        /* no drive letter, no \, so relative path - get cur dir from startup */
        else
        {
                ssize_t cwd_len;
                cwd_len = strlen(__fb_startup_cwd);

                len = cwd_len + 1 + argv_len;
                if( len >= maxlen )
                        return NULL;

                memcpy( dst, __fb_startup_cwd, cwd_len );
                dst[cwd_len] = '\\';
                memcpy( dst + cwd_len + 1, __fb_ctx.argv[0], argv_len );
                dst[len] = '\0';
        }

        fb_hConvertPath( dst );

        p = strrchr( dst, '\\' );
        if( p != NULL )
                *p = '\0';

        /* upcase drive letter to be consistent with win32 port */
        dst[0] = toupper( dst[0] );

        /* just a drive letter? make sure \ follows to prevent using relative path */
        if( maxlen > 3 && dst[2] == '\0' && dst[1] == ':' && isalpha(dst[0]) )
        {
                dst[2] = '\\';
                dst[3] = '\0';
        }

        return p;
}