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/* Dependency generator for Makefile fragments.

   Copyright (C) 2000, 2001, 2003, 2007, 2008, 2009

   Free Software Foundation, Inc.

   Contributed by Zack Weinberg, Mar 2000

This program is free software; you can redistribute it and/or modify it

under the terms of the GNU General Public License as published by the

Free Software Foundation; either version 3, or (at your option) any

later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.

 In other words, you are welcome to use, share and improve this program.

 You are forbidden to forbid anyone else to use, share and improve

 what you give them.   Help stamp out software-hoarding!  */

#include "config.h"

#include "system.h"

#include "mkdeps.h"

/* Keep this structure local to this file, so clients don't find it

   easy to start making assumptions.  */

struct deps

{

  const char **targetv;

  unsigned int ntargets;        /* number of slots actually occupied */

  unsigned int targets_size;    /* amt of allocated space - in words */

  const char **depv;

  unsigned int ndeps;

  unsigned int deps_size;

  const char **vpathv;

  size_t *vpathlv;

  unsigned int nvpaths;

  unsigned int vpaths_size;

};

static const char *munge (const char *);

/* Given a filename, quote characters in that filename which are

   significant to Make.  Note that it's not possible to quote all such

   characters - e.g. \n, %, *, ?, [, \ (in some contexts), and ~ are

   not properly handled.  It isn't possible to get this right in any

   current version of Make.  (??? Still true?  Old comment referred to

   3.76.1.)  */

static const char *

munge (const char *filename)

{

  int len;

  const char *p, *q;

  char *dst, *buffer;

  for (p = filename, len = 0; *p; p++, len++)

    {

      switch (*p)

        {

        case ' ':

        case '\t':

          /* GNU make uses a weird quoting scheme for white space.

             A space or tab preceded by 2N+1 backslashes represents

             N backslashes followed by space; a space or tab

             preceded by 2N backslashes represents N backslashes at

             the end of a file name; and backslashes in other

             contexts should not be doubled.  */

          for (q = p - 1; filename <= q && *q == '\\';  q--)

            len++;

          len++;

          break;

        case '$':

          /* '$' is quoted by doubling it.  */

          len++;

          break;

        case '#':

          /* '#' is quoted with a backslash.  */

          len++;

          break;

        }

    }

  /* Now we know how big to make the buffer.  */

  buffer = XNEWVEC (char, len + 1);

  for (p = filename, dst = buffer; *p; p++, dst++)

    {

      switch (*p)

        {

        case ' ':

        case '\t':

          for (q = p - 1; filename <= q && *q == '\\';  q--)

            *dst++ = '\\';

          *dst++ = '\\';

          break;

        case '$':

          *dst++ = '$';

          break;

        case '#':

          *dst++ = '\\';

          break;

        default:

          /* nothing */;

        }

      *dst = *p;

    }

  *dst = '\0';

  return buffer;

}

/* If T begins with any of the partial pathnames listed in d->vpathv,

   then advance T to point beyond that pathname.  */

static const char *

apply_vpath (struct deps *d, const char *t)

{

  if (d->vpathv)

    {

      unsigned int i;

      for (i = 0; i < d->nvpaths; i++)

        {

          if (!strncmp (d->vpathv[i], t, d->vpathlv[i]))

            {

              const char *p = t + d->vpathlv[i];

              if (!IS_DIR_SEPARATOR (*p))

                goto not_this_one;

              /* Do not simplify $(vpath)/../whatever.  ??? Might not

                 be necessary. */

              if (p[1] == '.' && p[2] == '.' && IS_DIR_SEPARATOR (p[3]))

                goto not_this_one;

              /* found a match */

              t = t + d->vpathlv[i] + 1;

              break;

            }

        not_this_one:;

        }

    }

  /* Remove leading ./ in any case.  */

  while (t[0] == '.' && IS_DIR_SEPARATOR (t[1]))

    {

      t += 2;

      /* If we removed a leading ./, then also remove any /s after the

         first.  */

      while (IS_DIR_SEPARATOR (t[0]))

        ++t;

    }

  return t;

}

/* Public routines.  */

struct deps *

deps_init (void)

{

  return XCNEW (struct deps);

}

void

deps_free (struct deps *d)

{

  unsigned int i;

  if (d->targetv)

    {

      for (i = 0; i < d->ntargets; i++)

        free ((void *) d->targetv[i]);

      free (d->targetv);

    }

  if (d->depv)

    {

      for (i = 0; i < d->ndeps; i++)

        free ((void *) d->depv[i]);

      free (d->depv);

    }

  if (d->vpathv)

    {

      for (i = 0; i < d->nvpaths; i++)

        free ((void *) d->vpathv[i]);

      free (d->vpathv);

      free (d->vpathlv);

    }

  free (d);

}

/* Adds a target T.  We make a copy, so it need not be a permanent

   string.  QUOTE is true if the string should be quoted.  */

void

deps_add_target (struct deps *d, const char *t, int quote)

{

  if (d->ntargets == d->targets_size)

    {

      d->targets_size = d->targets_size * 2 + 4;

      d->targetv = XRESIZEVEC (const char *, d->targetv, d->targets_size);

    }

  t = apply_vpath (d, t);

  if (quote)

    t = munge (t);  /* Also makes permanent copy.  */

  else

    t = xstrdup (t);

  d->targetv[d->ntargets++] = t;

}

/* Sets the default target if none has been given already.  An empty

   string as the default target in interpreted as stdin.  The string

   is quoted for MAKE.  */

void

deps_add_default_target (struct deps *d, const char *tgt)

{

  /* Only if we have no targets.  */

  if (d->ntargets)

    return;

  if (tgt[0] == '\0')

    deps_add_target (d, "-", 1);

  else

    {

#ifndef TARGET_OBJECT_SUFFIX

# define TARGET_OBJECT_SUFFIX ".o"

#endif

      const char *start = lbasename (tgt);

      char *o = (char *) alloca (strlen (start)

                                 + strlen (TARGET_OBJECT_SUFFIX) + 1);

      char *suffix;

      strcpy (o, start);

      suffix = strrchr (o, '.');

      if (!suffix)

        suffix = o + strlen (o);

      strcpy (suffix, TARGET_OBJECT_SUFFIX);

      deps_add_target (d, o, 1);

    }

}

void

deps_add_dep (struct deps *d, const char *t)

{

  t = munge (apply_vpath (d, t));  /* Also makes permanent copy.  */

  if (d->ndeps == d->deps_size)

    {

      d->deps_size = d->deps_size * 2 + 8;

      d->depv = XRESIZEVEC (const char *, d->depv, d->deps_size);

    }

  d->depv[d->ndeps++] = t;

}

void

deps_add_vpath (struct deps *d, const char *vpath)

{

  const char *elem, *p;

  char *copy;

  size_t len;

  for (elem = vpath; *elem; elem = p)

    {

      for (p = elem; *p && *p != ':'; p++);

      len = p - elem;

      copy = XNEWVEC (char, len + 1);

      memcpy (copy, elem, len);

      copy[len] = '\0';

      if (*p == ':')

        p++;

      if (d->nvpaths == d->vpaths_size)

        {

          d->vpaths_size = d->vpaths_size * 2 + 8;

          d->vpathv = XRESIZEVEC (const char *, d->vpathv, d->vpaths_size);

          d->vpathlv = XRESIZEVEC (size_t, d->vpathlv, d->vpaths_size);

        }

      d->vpathv[d->nvpaths] = copy;

      d->vpathlv[d->nvpaths] = len;

      d->nvpaths++;

    }

}

void

deps_write (const struct deps *d, FILE *fp, unsigned int colmax)

{

  unsigned int size, i, column;

  column = 0;

  if (colmax && colmax < 34)

    colmax = 34;

  for (i = 0; i < d->ntargets; i++)

    {

      size = strlen (d->targetv[i]);

      column += size;

      if (i)

        {

          if (colmax && column > colmax)

            {

              fputs (" \\\n ", fp);

              column = 1 + size;

            }

          else

            {

              putc (' ', fp);

              column++;

            }

        }

      fputs (d->targetv[i], fp);

    }

  putc (':', fp);

  column++;

  for (i = 0; i < d->ndeps; i++)

    {

      size = strlen (d->depv[i]);

      column += size;

      if (colmax && column > colmax)

        {

          fputs (" \\\n ", fp);

          column = 1 + size;

        }

      else

        {

          putc (' ', fp);

          column++;

        }

      fputs (d->depv[i], fp);

    }

  putc ('\n', fp);

}

void

deps_phony_targets (const struct deps *d, FILE *fp)

{

  unsigned int i;

  for (i = 1; i < d->ndeps; i++)

    {

      putc ('\n', fp);

      fputs (d->depv[i], fp);

      putc (':', fp);

      putc ('\n', fp);

    }

}

/* Write out a deps buffer to a file, in a form that can be read back

   with deps_restore.  Returns nonzero on error, in which case the

   error number will be in errno.  */

int

deps_save (struct deps *deps, FILE *f)

{

  unsigned int i;

  /* The cppreader structure contains makefile dependences.  Write out this

     structure.  */

  /* The number of dependences.  */

  if (fwrite (&deps->ndeps, sizeof (deps->ndeps), 1, f) != 1)

      return -1;

  /* The length of each dependence followed by the string.  */

  for (i = 0; i < deps->ndeps; i++)

    {

      size_t num_to_write = strlen (deps->depv[i]);

      if (fwrite (&num_to_write, sizeof (size_t), 1, f) != 1)

          return -1;

      if (fwrite (deps->depv[i], num_to_write, 1, f) != 1)

          return -1;

    }

  return 0;

}

/* Read back dependency information written with deps_save into

   the deps buffer.  The third argument may be NULL, in which case

   the dependency information is just skipped, or it may be a filename,

   in which case that filename is skipped.  */

int

deps_restore (struct deps *deps, FILE *fd, const char *self)

{

  unsigned int i, count;

  size_t num_to_read;

  size_t buf_size = 512;

  char *buf = XNEWVEC (char, buf_size);

  /* Number of dependences.  */

  if (fread (&count, 1, sizeof (count), fd) != sizeof (count))

    return -1;

  /* The length of each dependence string, followed by the string.  */

  for (i = 0; i < count; i++)

    {

      /* Read in # bytes in string.  */

      if (fread (&num_to_read, 1, sizeof (size_t), fd) != sizeof (size_t))

        return -1;

      if (buf_size < num_to_read + 1)

        {

          buf_size = num_to_read + 1 + 127;

          buf = XRESIZEVEC (char, buf, buf_size);

        }

      if (fread (buf, 1, num_to_read, fd) != num_to_read)

        return -1;

      buf[num_to_read] = '\0';

      /* Generate makefile dependencies from .pch if -nopch-deps.  */

      if (self != NULL && strcmp (buf, self) != 0)

        deps_add_dep (deps, buf);

    }

  free (buf);

  return 0;

}