| 1 | /* depend.c - Handle dependency tracking. |
| 2 | Copyright (C) 1997 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GAS, the GNU Assembler. |
| 5 | |
| 6 | GAS is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GAS is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GAS; see the file COPYING. If not, write to the Free |
| 18 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
| 19 | 02111-1307, USA. */ |
| 20 | |
| 21 | #include "as.h" |
| 22 | |
| 23 | /* The file to write to, or NULL if no dependencies being kept. */ |
| 24 | static char *dep_file = NULL; |
| 25 | |
| 26 | struct dependency |
| 27 | { |
| 28 | char *file; |
| 29 | struct dependency *next; |
| 30 | }; |
| 31 | |
| 32 | /* All the files we depend on. */ |
| 33 | static struct dependency *dep_chain = NULL; |
| 34 | |
| 35 | /* Current column in output file. */ |
| 36 | static int column = 0; |
| 37 | |
| 38 | static void wrap_output PARAMS ((FILE *, char *, int)); |
| 39 | |
| 40 | /* Number of columns allowable. */ |
| 41 | #define MAX_COLUMNS 72 |
| 42 | |
| 43 | \f |
| 44 | |
| 45 | /* Start saving dependencies, to be written to FILENAME. If this is |
| 46 | never called, then dependency tracking is simply skipped. */ |
| 47 | |
| 48 | void |
| 49 | start_dependencies (filename) |
| 50 | char *filename; |
| 51 | { |
| 52 | dep_file = filename; |
| 53 | } |
| 54 | |
| 55 | /* Noticed a new filename, so try to register it. */ |
| 56 | |
| 57 | void |
| 58 | register_dependency (filename) |
| 59 | char *filename; |
| 60 | { |
| 61 | struct dependency *dep; |
| 62 | |
| 63 | if (dep_file == NULL) |
| 64 | return; |
| 65 | |
| 66 | for (dep = dep_chain; dep != NULL; dep = dep->next) |
| 67 | { |
| 68 | if (! strcmp (filename, dep->file)) |
| 69 | return; |
| 70 | } |
| 71 | |
| 72 | dep = (struct dependency *) xmalloc (sizeof (struct dependency)); |
| 73 | dep->file = xstrdup (filename); |
| 74 | dep->next = dep_chain; |
| 75 | dep_chain = dep; |
| 76 | } |
| 77 | |
| 78 | /* Append some output to the file, keeping track of columns and doing |
| 79 | wrapping as necessary. */ |
| 80 | |
| 81 | static void |
| 82 | wrap_output (f, string, spacer) |
| 83 | FILE *f; |
| 84 | char *string; |
| 85 | int spacer; |
| 86 | { |
| 87 | int len = strlen (string); |
| 88 | |
| 89 | if (len == 0) |
| 90 | return; |
| 91 | |
| 92 | if (column && MAX_COLUMNS - 1 /*spacer*/ - 2 /*` \'*/ < column + len) |
| 93 | { |
| 94 | fprintf (f, " \\\n "); |
| 95 | column = 0; |
| 96 | if (spacer == ' ') |
| 97 | spacer = '\0'; |
| 98 | } |
| 99 | |
| 100 | if (spacer == ' ') |
| 101 | { |
| 102 | putc (spacer, f); |
| 103 | ++column; |
| 104 | } |
| 105 | |
| 106 | fputs (string, f); |
| 107 | column += len; |
| 108 | |
| 109 | if (spacer == ':') |
| 110 | { |
| 111 | putc (spacer, f); |
| 112 | ++column; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | /* Print dependency file. */ |
| 117 | |
| 118 | void |
| 119 | print_dependencies () |
| 120 | { |
| 121 | FILE *f; |
| 122 | struct dependency *dep; |
| 123 | |
| 124 | if (dep_file == NULL) |
| 125 | return; |
| 126 | |
| 127 | f = fopen (dep_file, "w"); |
| 128 | if (f == NULL) |
| 129 | { |
| 130 | as_warn ("Can't open `%s' for writing", dep_file); |
| 131 | return; |
| 132 | } |
| 133 | |
| 134 | column = 0; |
| 135 | wrap_output (f, out_file_name, ':'); |
| 136 | for (dep = dep_chain; dep != NULL; dep = dep->next) |
| 137 | wrap_output (f, dep->file, ' '); |
| 138 | |
| 139 | putc ('\n', f); |
| 140 | |
| 141 | if (fclose (f)) |
| 142 | as_warn ("Can't close %s", dep_file); |
| 143 | } |