command.h

Go to the documentation of this file.

/*
 * Copyright 1994 Christopher Seiwald.
 *
 * This file is part of Jam - see jam.c for Copyright information.
 */

/*
 * command.h - the CMD structure and routines to manipulate them
 *
 * Both ACTION and CMD contain a rule, targets, and sources.  An
 * ACTION describes a rule to be applied to the given targets and
 * sources; a CMD is what actually gets executed by the shell.  The
 * differences are due to:
 *
 *  ACTIONS must be combined if 'actions together' is given.
 *  ACTIONS must be split if 'actions piecemeal' is given.
 *  ACTIONS must have current sources omitted for 'actions updated'.
 *
 * The CMD datatype holds a single command that is to be executed 
 * against a target, and they can chain together to represent the 
 * full collection of commands used to update a target.
 *
 * Structures:
 *
 *  CMD - an action, ready to be formatted into a buffer and executed
 *
 * External routines:
 *
 *  cmd_new() - return a new CMD or 0 if too many args
 *  cmd_free() - delete CMD and its parts
 *  cmd_next() - walk the CMD chain
 */

/*
 * CMD - an action, ready to be formatted into a buffer and executed
 */

typedef struct _cmd CMD;

struct _cmd
{
    CMD *next;
    CMD *tail;      /* valid on in head */
    RULE    *rule;      /* rule->actions contains shell script */
    LIST    *shell;     /* $(SHELL) value */
    LOL args;       /* LISTs for $(<), $(>) */
    char    buf[ MAXLINE ]; /* actual commands */
} ;

CMD *cmd_new(
    RULE    *rule,      /* rule (referenced) */
    LIST    *targets,   /* $(<) (freed) */
    LIST    *sources,   /* $(>) (freed) */
    LIST    *shell,     /* $(SHELL) (freed) */
    int maxline );  /* max line length */

void cmd_free( CMD *cmd );

# define cmd_next( c ) ((c)->next)

---