143 lines
3 KiB
C
143 lines
3 KiB
C
/* depend.c - Handle dependency tracking.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "as.h"
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/* The file to write to, or NULL if no dependencies being kept. */
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static char *dep_file = NULL;
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struct dependency
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{
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char *file;
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struct dependency *next;
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};
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/* All the files we depend on. */
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static struct dependency *dep_chain = NULL;
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/* Current column in output file. */
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static int column = 0;
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static void wrap_output PARAMS ((FILE *, char *, int));
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/* Number of columns allowable. */
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#define MAX_COLUMNS 72
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/* Start saving dependencies, to be written to FILENAME. If this is
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never called, then dependency tracking is simply skipped. */
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void
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start_dependencies (filename)
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char *filename;
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{
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dep_file = filename;
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}
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/* Noticed a new filename, so try to register it. */
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void
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register_dependency (filename)
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char *filename;
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{
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struct dependency *dep;
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if (dep_file == NULL)
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return;
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for (dep = dep_chain; dep != NULL; dep = dep->next)
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{
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if (! strcmp (filename, dep->file))
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return;
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}
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dep = (struct dependency *) xmalloc (sizeof (struct dependency));
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dep->file = xstrdup (filename);
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dep->next = dep_chain;
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dep_chain = dep;
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}
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/* Append some output to the file, keeping track of columns and doing
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wrapping as necessary. */
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static void
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wrap_output (f, string, spacer)
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FILE *f;
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char *string;
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int spacer;
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{
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int len = strlen (string);
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if (len == 0)
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return;
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if (column && MAX_COLUMNS - 1 /*spacer*/ - 2 /*` \'*/ < column + len)
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{
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fprintf (f, " \\\n ");
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column = 0;
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if (spacer == ' ')
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spacer = '\0';
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}
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if (spacer == ' ')
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{
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putc (spacer, f);
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++column;
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}
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fputs (string, f);
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column += len;
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if (spacer == ':')
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{
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putc (spacer, f);
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++column;
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}
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}
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/* Print dependency file. */
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void
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print_dependencies ()
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{
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FILE *f;
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struct dependency *dep;
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if (dep_file == NULL)
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return;
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f = fopen (dep_file, "w");
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if (f == NULL)
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{
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as_warn ("Can't open `%s' for writing", dep_file);
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return;
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}
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column = 0;
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wrap_output (f, out_file_name, ':');
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for (dep = dep_chain; dep != NULL; dep = dep->next)
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wrap_output (f, dep->file, ' ');
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putc ('\n', f);
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if (fclose (f))
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as_warn ("Can't close %s", dep_file);
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}
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