?? process.c
字號:
/* process.c * command processing layer * * The process(char **arglist) function is called by the main loop * It sits in front of the execute() function. This layer handles * two main classes of processing: * a) built-in functions (e.g. exit(), set, =, read, .. ) * b) control structures (e.g. if, while, for) */#include <stdio.h>#include "smsh.h"int is_control_command(char *);int do_control_command(char **);int ok_to_execute();int process(char **args)/* * purpose: process user command * returns: result of processing command * details: if a built-in then call appropriate function, if not execute() * errors: arise from subroutines, handled there */{ int rv = 0; if ( args[0] == NULL ) rv = 0; else if ( is_control_command(args[0]) ) rv = do_control_command(args); else if ( ok_to_execute() ) rv = execute(args); return rv;}
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