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b14209b789
Cleanup done while researching the Boost Jam internals. Added better implementation description comments at many places. Cleaned up the 'dependant' and 'dependency' terminology that got mixed up in several places. Renamed several functions to use underscores as word separators. [SVN r48480]
101 lines
2.1 KiB
C
101 lines
2.1 KiB
C
/*
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* Copyright 1993, 1995 Christopher Seiwald.
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*
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* This file is part of Jam - see jam.c for Copyright information.
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*/
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/* This file is ALSO:
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* Copyright 2001-2004 David Abrahams.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
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*/
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/*
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* command.c - maintain lists of commands
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*/
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#include "jam.h"
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#include "lists.h"
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#include "parse.h"
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#include "variable.h"
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#include "rules.h"
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#include "command.h"
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#include <limits.h>
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#include <string.h>
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/*
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* cmd_new() - return a new CMD or 0 if too many args
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*/
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CMD * cmd_new( RULE * rule, LIST * targets, LIST * sources, LIST * shell )
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{
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CMD * cmd = (CMD *)BJAM_MALLOC( sizeof( CMD ) );
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/* Lift line-length limitation entirely when JAMSHELL is just "%". */
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int no_limit = ( shell && !strcmp(shell->string,"%") && !list_next(shell) );
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int max_line = MAXLINE;
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int allocated = -1;
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cmd->rule = rule;
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cmd->shell = shell;
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cmd->next = 0;
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lol_init( &cmd->args );
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lol_add( &cmd->args, targets );
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lol_add( &cmd->args, sources );
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cmd->buf = 0;
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do
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{
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BJAM_FREE( cmd->buf ); /* free any buffer from previous iteration */
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cmd->buf = (char*)BJAM_MALLOC_ATOMIC( max_line + 1 );
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if ( cmd->buf == 0 )
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break;
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allocated = var_string( rule->actions->command, cmd->buf, max_line, &cmd->args );
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max_line = max_line * 2;
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}
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while ( ( allocated < 0 ) && ( max_line < INT_MAX / 2 ) );
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if ( !no_limit )
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{
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/* Bail if the result will not fit in MAXLINE. */
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char * s = cmd->buf;
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while ( *s )
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{
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size_t l = strcspn( s, "\n" );
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if ( l > MAXLINE )
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{
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/* We do not free targets/sources/shell if bailing. */
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cmd_free( cmd );
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return 0;
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}
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s += l;
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if ( *s )
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++s;
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}
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}
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return cmd;
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}
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/*
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* cmd_free() - free a CMD
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*/
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void cmd_free( CMD * cmd )
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{
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lol_free( &cmd->args );
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list_free( cmd->shell );
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BJAM_FREE( cmd->buf );
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BJAM_FREE( (char *)cmd );
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}
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