1 /*
2 * Copyright 1993, 1995 Christopher Seiwald.
3 * Copyright 2007 Noel Belcourt.
4 *
5 * Utility functions shared between different exec*.c platform specific
6 * implementation modules.
7 *
8 * This file is part of Jam - see jam.c for Copyright information.
9 */
10
11 #include "jam.h"
12 #include "execcmd.h"
13 #include "output.h"
14
15 #include <assert.h>
16 #include <stdio.h>
17 #include <string.h>
18
19
20 /* Internal interrupt counter. */
21 static int intr;
22
23
24 /* Constructs a list of command-line elements using the format specified by the
25 * given shell list.
26 *
27 * Given argv array should have at least MAXARGC + 1 elements.
28 * Slot numbers may be between 0 and 998 (inclusive).
29 *
30 * Constructed argv list will be zero terminated. Character arrays referenced by
31 * the argv structure elements will be either elements from the give shell list,
32 * internal static buffers or the given command string and should thus not
33 * considered owned by or released via the argv structure and should be
34 * considered invalidated by the next argv_from_shell() call.
35 *
36 * Shell list elements:
37 * - Starting with '%' - represent the command string.
38 * - Starting with '!' - represent the slot number (increased by one).
39 * - Anything else - used as a literal.
40 * - If no '%' element is found, the command string is appended as an extra.
41 */
42
argv_from_shell(char const ** argv,LIST * shell,char const * command,int const slot)43 void argv_from_shell( char const * * argv, LIST * shell, char const * command,
44 int const slot )
45 {
46 static char jobno[ 4 ];
47
48 int i;
49 int gotpercent = 0;
50 LISTITER iter = list_begin( shell );
51 LISTITER end = list_end( shell );
52
53 assert( 0 <= slot );
54 assert( slot < 999 );
55 sprintf( jobno, "%d", slot + 1 );
56
57 for ( i = 0; iter != end && i < MAXARGC; ++i, iter = list_next( iter ) )
58 {
59 switch ( object_str( list_item( iter ) )[ 0 ] )
60 {
61 case '%': argv[ i ] = command; ++gotpercent; break;
62 case '!': argv[ i ] = jobno; break;
63 default : argv[ i ] = object_str( list_item( iter ) );
64 }
65 }
66
67 if ( !gotpercent )
68 argv[ i++ ] = command;
69
70 argv[ i ] = NULL;
71 }
72
73
74 /* Returns whether the given command string contains lines longer than the given
75 * maximum.
76 */
check_cmd_for_too_long_lines(char const * command,int const max,int * const error_length,int * const error_max_length)77 int check_cmd_for_too_long_lines( char const * command, int const max,
78 int * const error_length, int * const error_max_length )
79 {
80 while ( *command )
81 {
82 size_t const l = strcspn( command, "\n" );
83 if ( l > max )
84 {
85 *error_length = l;
86 *error_max_length = max;
87 return EXEC_CHECK_LINE_TOO_LONG;
88 }
89 command += l;
90 if ( *command )
91 ++command;
92 }
93 return EXEC_CHECK_OK;
94 }
95
96
97 /* Checks whether the given shell list is actually a request to execute raw
98 * commands without an external shell.
99 */
is_raw_command_request(LIST * shell)100 int is_raw_command_request( LIST * shell )
101 {
102 return !list_empty( shell ) &&
103 !strcmp( object_str( list_front( shell ) ), "%" ) &&
104 list_next( list_begin( shell ) ) == list_end( shell );
105 }
106
107
108 /* Returns whether an interrupt has been detected so far. */
109
interrupted(void)110 int interrupted( void )
111 {
112 return intr != 0;
113 }
114
115
116 /* Internal interrupt handler. */
117
onintr(int disp)118 void onintr( int disp )
119 {
120 ++intr;
121 out_printf( "...interrupted\n" );
122 }
123