/* Generate graphic from memory profiling data.
   Copyright (C) 1998-2023 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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; version 2 of the License, 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; if not, see <https://www.gnu.org/licenses/>.  */

#define _FILE_OFFSET_BITS 64

#include <argp.h>
#include <assert.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <getopt.h>
#include <inttypes.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/param.h>
#include <sys/stat.h>

#include <gd.h>
#include <gdfontl.h>
#include <gdfonts.h>

#include "../version.h"
#define PACKAGE _libc_intl_domainname

/* Default size of the generated image.  */
#define XSIZE 800
#define YSIZE 600

#ifndef N_
# define N_(Arg) Arg
#endif


/* Definitions of arguments for argp functions.  */
static const struct argp_option options[] =
{
  { "output", 'o', N_ ("FILE"), 0, N_ ("Name output file") },
  { "string", 's', N_ ("STRING"), 0, N_ ("Title string used in output graphic") },
  { "time", 't', NULL, 0, N_ ("\
Generate output linear to time (default is linear to number of function calls)\
") },
  { "total", 'T', NULL, 0,
    N_ ("Also draw graph for total memory consumption") },
  { "x-size", 'x', N_ ("VALUE"), 0,
    N_ ("Make output graphic VALUE pixels wide") },
  { "y-size", 'y', "VALUE", 0, N_ ("Make output graphic VALUE pixels high") },
  { NULL, 0, NULL, 0, NULL }
};

/* Short description of program.  */
static const char doc[] = N_ ("Generate graphic from memory profiling data");

/* Strings for arguments in help texts.  */
static const char args_doc[] = N_ ("DATAFILE [OUTFILE]");

/* Prototype for option handler.  */
static error_t parse_opt (int key, char *arg, struct argp_state *state);

/* Function to print some extra text in the help message.  */
static char *more_help (int key, const char *text, void *input);

/* Name and version of program.  */
static void print_version (FILE *stream, struct argp_state *state);
void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;

/* Data structure to communicate with argp functions.  */
static struct argp argp =
{
  options, parse_opt, args_doc, doc, NULL, more_help
};


struct entry
{
  uint64_t heap;
  uint64_t stack;
  uint32_t time_low;
  uint32_t time_high;
};


/* Size of the image.  */
static size_t xsize;
static size_t ysize;

/* Name of the output file.  */
static char *outname;

/* Title string for the graphic.  */
static const char *string;

/* Nonzero if graph should be generated linear in time.  */
static int time_based;

/* Nonzero if graph to display total use of memory should be drawn as well.  */
static int also_total = 0;


int
main (int argc, char *argv[])
{
  int remaining;
  const char *inname;
  gdImagePtr im_out;
  int grey, blue, red, green, yellow, black;
  int fd;
  struct stat st;
  size_t maxsize_heap;
  size_t maxsize_stack;
  size_t maxsize_total;
  uint64_t total;
  uint64_t cnt, cnt2;
  FILE *outfile;
  char buf[30];
  size_t last_heap;
  size_t last_stack;
  size_t last_total;
  struct entry headent[2];
  uint64_t start_time;
  uint64_t end_time;
  uint64_t total_time;
  const char *heap_format, *stack_format;
  int heap_scale, stack_scale, line;

  outname = NULL;
  xsize = XSIZE;
  ysize = YSIZE;
  string = NULL;

  /* Parse and process arguments.  */
  argp_parse (&argp, argc, argv, 0, &remaining, NULL);

  if (remaining >= argc || remaining + 2 < argc)
    {
      argp_help (&argp, stdout, ARGP_HELP_SEE | ARGP_HELP_EXIT_ERR,
                 program_invocation_short_name);
      exit (1);
    }

  inname = argv[remaining++];

  if (remaining < argc)
    outname = argv[remaining];
  else if (outname == NULL)
    {
      size_t len = strlen (inname);
      outname = alloca (len + 5);
      stpcpy (stpcpy (outname, inname), ".png");
    }

  /* Open for read/write since we try to repair the file in case the
     application hasn't terminated cleanly.  */
  fd = open (inname, O_RDWR);
  if (fd == -1)
    error (EXIT_FAILURE, errno, "cannot open input file");
  if (fstat (fd, &st) != 0)
    {
      close (fd);
      error (EXIT_FAILURE, errno, "cannot get size of input file");
    }
  /* Test whether the file contains only full records.  */
  if ((st.st_size % sizeof (struct entry)) != 0
      /* The file must at least contain the two administrative records.  */
      || st.st_size < 2 * sizeof (struct entry))
    {
      close (fd);
      error (EXIT_FAILURE, 0, "input file has incorrect size");
    }
  /* Compute number of data entries.  */
  total = st.st_size / sizeof (struct entry) - 2;

  /* Read the administrative information.  */
  read (fd, headent, sizeof (headent));
  maxsize_heap = headent[1].heap;
  maxsize_stack = headent[1].stack;
  maxsize_total = headent[0].stack;

  if (maxsize_heap == 0 && maxsize_stack == 0)
    {
      /* The program aborted before memusage was able to write the
         information about the maximum heap and stack use.  Repair
         the file now.  */
      struct entry next;

      while (1)
        {
          if (read (fd, &next, sizeof (next)) == 0)
            break;
          if (next.heap > maxsize_heap)
            maxsize_heap = next.heap;
          if (next.stack > maxsize_stack)
            maxsize_stack = next.stack;
          if (maxsize_heap + maxsize_stack > maxsize_total)
            maxsize_total = maxsize_heap + maxsize_stack;
        }

      headent[0].stack = maxsize_total;
      headent[1].heap = maxsize_heap;
      headent[1].stack = maxsize_stack;
      headent[1].time_low = next.time_low;
      headent[1].time_high = next.time_high;

      /* Write the computed values in the file.  */
      lseek (fd, 0, SEEK_SET);
      write (fd, headent, 2 * sizeof (struct entry));
    }

  if (also_total)
    {
      /* We use one scale and since we also draw the total amount of
         memory used we have to adapt the maximum.  */
      maxsize_heap = maxsize_total;
      maxsize_stack = maxsize_total;
    }

  start_time = ((uint64_t) headent[0].time_high) << 32 | headent[0].time_low;
  end_time = ((uint64_t) headent[1].time_high) << 32 | headent[1].time_low;
  total_time = end_time - start_time;

  if (xsize < 100)
    xsize = 100;
  if (ysize < 80)
    ysize = 80;

  /* Create output image with the specified size.  */
  im_out = gdImageCreate (xsize, ysize);

  /* First color allocated is background.  */
  grey = gdImageColorAllocate (im_out, 224, 224, 224);

  /* Set transparent color. */
  gdImageColorTransparent (im_out, grey);

  /* These are all the other colors we need (in the moment).  */
  red = gdImageColorAllocate (im_out, 255, 0, 0);
  green = gdImageColorAllocate (im_out, 0, 130, 0);
  blue = gdImageColorAllocate (im_out, 0, 0, 255);
  yellow = gdImageColorAllocate (im_out, 154, 205, 50);
  black = gdImageColorAllocate (im_out, 0, 0, 0);

  gdImageRectangle (im_out, 40, 20, xsize - 40, ysize - 20, blue);

  if (maxsize_heap < 1024)
    {
      heap_format = "%Zu";
      heap_scale = 1;
    }
  else if (maxsize_heap < 1024 * 1024 * 100)
    {
      heap_format = "%Zuk";
      heap_scale = 1024;
    }
  else
    {
      heap_format = "%ZuM";
      heap_scale = 1024 * 1024;
    }

  if (maxsize_stack < 1024)
    {
      stack_format = "%Zu";
      stack_scale = 1;
    }
  else if (maxsize_stack < 1024 * 1024 * 100)
    {
      stack_format = "%Zuk";
      stack_scale = 1024;
    }
  else
    {
      stack_format = "%ZuM";
      stack_scale = 1024 * 1024;
    }

  gdImageString (im_out, gdFontSmall, 38, ysize - 14, (unsigned char *) "0",
                 blue);
  snprintf (buf, sizeof (buf), heap_format, 0);
  gdImageString (im_out, gdFontSmall, maxsize_heap < 1024 ? 32 : 26,
                 ysize - 26, (unsigned char *) buf, red);
  snprintf (buf, sizeof (buf), stack_format, 0);
  gdImageString (im_out, gdFontSmall, xsize - 37, ysize - 26,
                 (unsigned char *) buf, green);

  if (string != NULL)
    gdImageString (im_out, gdFontLarge, (xsize - strlen (string) * 8) / 2,
                   2, (unsigned char *) string, green);

  gdImageStringUp (im_out, gdFontSmall, 1, ysize / 2 - 10,
                   (unsigned char *) "allocated", red);
  gdImageStringUp (im_out, gdFontSmall, 11, ysize / 2 - 10,
                   (unsigned char *) "memory", red);

  gdImageStringUp (im_out, gdFontSmall, xsize - 39, ysize / 2 - 10,
                   (unsigned char *) "used", green);
  gdImageStringUp (im_out, gdFontSmall, xsize - 27, ysize / 2 - 10,
                   (unsigned char *) "stack", green);

  snprintf (buf, sizeof (buf), heap_format, maxsize_heap / heap_scale);
  gdImageString (im_out, gdFontSmall, 39 - strlen (buf) * 6, 14,
                 (unsigned char *) buf, red);
  snprintf (buf, sizeof (buf), stack_format, maxsize_stack / stack_scale);
  gdImageString (im_out, gdFontSmall, xsize - 37, 14,
                 (unsigned char *) buf, green);

  for (line = 1; line <= 3; ++line)
    {
      if (maxsize_heap > 0)
        {
          cnt = (((ysize - 40) * (maxsize_heap / 4 * line / heap_scale))
                 / (maxsize_heap / heap_scale));
          gdImageDashedLine (im_out, 40, ysize - 20 - cnt, xsize - 40,
                             ysize - 20 - cnt, red);
          snprintf (buf, sizeof (buf), heap_format,
                    maxsize_heap / 4 * line / heap_scale);
          gdImageString (im_out, gdFontSmall, 39 - strlen (buf) * 6,
                         ysize - 26 - cnt, (unsigned char *) buf, red);
        }
      else
        cnt = 0;

      if (maxsize_stack > 0)
        cnt2 = (((ysize - 40) * (maxsize_stack / 4 * line / stack_scale))
                / (maxsize_stack / stack_scale));
      else
        cnt2 = 0;

      if (cnt != cnt2)
        gdImageDashedLine (im_out, 40, ysize - 20 - cnt2, xsize - 40,
                           ysize - 20 - cnt2, green);
      snprintf (buf, sizeof (buf), stack_format,
		maxsize_stack / 4 * line / stack_scale);
      gdImageString (im_out, gdFontSmall, xsize - 37, ysize - 26 - cnt2,
                     (unsigned char *) buf, green);
    }

  snprintf (buf, sizeof (buf), "%llu", (unsigned long long) total);
  gdImageString (im_out, gdFontSmall, xsize - 50, ysize - 14,
                 (unsigned char *) buf, blue);

  if (!time_based)
    {
      uint64_t previously = start_time;

      gdImageString (im_out, gdFontSmall, 40 + (xsize - 32 * 6 - 80) / 2,
                     ysize - 12,
                     (unsigned char *) "# memory handling function calls",
                     blue);


      last_stack = last_heap = last_total = ysize - 20;
      for (cnt = 1; cnt <= total; ++cnt)
        {
          struct entry entry;
          size_t new[2];
          uint64_t now;

          read (fd, &entry, sizeof (entry));

          now = ((uint64_t) entry.time_high) << 32 | entry.time_low;

          if ((((previously - start_time) * 100) / total_time) % 10 < 5)
            gdImageFilledRectangle (im_out,
                                    40 + ((cnt - 1) * (xsize - 80)) / total,
                                    ysize - 19,
                                    39 + (cnt * (xsize - 80)) / total,
                                    ysize - 14, yellow);
          previously = now;

          if (also_total && maxsize_heap > 0)
            {
              size_t new3;

              new3 = (ysize - 20) - ((((unsigned long long int) (ysize - 40))
                                      * (entry.heap + entry.stack))
                                     / maxsize_heap);
              gdImageLine (im_out, 40 + ((xsize - 80) * (cnt - 1)) / total,
                           last_total,
                           40 + ((xsize - 80) * cnt) / total, new3,
                           black);
              last_total = new3;
            }

          if (maxsize_heap > 0)
            {
              new[0] = ((ysize - 20)
                        - ((((unsigned long long int) (ysize - 40))
                            * entry.heap) / maxsize_heap));
              gdImageLine (im_out, 40 + ((xsize - 80) * (cnt - 1)) / total,
                           last_heap, 40 + ((xsize - 80) * cnt) / total,
                           new[0], red);
              last_heap = new[0];
            }

          if (maxsize_stack > 0)
            {
              new[1] = ((ysize - 20)
                        - ((((unsigned long long int) (ysize - 40))
                            * entry.stack) / maxsize_stack));
              gdImageLine (im_out, 40 + ((xsize - 80) * (cnt - 1)) / total,
                           last_stack, 40 + ((xsize - 80) * cnt) / total,
                           new[1], green);
              last_stack = new[1];
            }
        }

      cnt = 0;
      while (cnt < total)
        {
          gdImageLine (im_out, 40 + ((xsize - 80) * cnt) / total, ysize - 20,
                       40 + ((xsize - 80) * cnt) / total, ysize - 15, blue);
          cnt += MAX (1, total / 20);
        }
      gdImageLine (im_out, xsize - 40, ysize - 20, xsize - 40, ysize - 15,
                   blue);
    }
  else
    {
      uint64_t next_tick = MAX (1, total / 20);
      size_t last_xpos = 40;

      gdImageString (im_out, gdFontSmall, 40 + (xsize - 39 * 6 - 80) / 2,
                     ysize - 12,
                     (unsigned char *) "				      \
# memory handling function calls / time", blue);

      for (cnt = 0; cnt < 20; cnt += 2)
        gdImageFilledRectangle (im_out,
                                40 + (cnt * (xsize - 80)) / 20, ysize - 19,
                                39 + ((cnt + 1) * (xsize - 80)) / 20,
                                ysize - 14, yellow);

      last_stack = last_heap = last_total = ysize - 20;
      for (cnt = 1; cnt <= total; ++cnt)
        {
          struct entry entry;
          size_t new[2];
          size_t xpos;
          uint64_t now;

          read (fd, &entry, sizeof (entry));

          now = ((uint64_t) entry.time_high) << 32 | entry.time_low;
          xpos = 40 + ((xsize - 80) * (now - start_time)) / total_time;

          if (cnt == next_tick)
            {
              gdImageLine (im_out, xpos, ysize - 20, xpos, ysize - 15, blue);
              next_tick += MAX (1, total / 20);
            }

          if (also_total && maxsize_heap > 0)
            {
              size_t new3;

              new3 = (ysize - 20) - ((((unsigned long long int) (ysize - 40))
                                      * (entry.heap + entry.stack))
                                     / maxsize_heap);
              gdImageLine (im_out, last_xpos, last_total, xpos, new3, black);
              last_total = new3;
            }

          if (maxsize_heap > 0)
            {
              new[0] = ((ysize - 20)
                        - ((((unsigned long long int) (ysize - 40))
                            * entry.heap) / maxsize_heap));
              gdImageLine (im_out, last_xpos, last_heap, xpos, new[0], red);
              last_heap = new[0];
            }

          if (maxsize_stack > 0)
            {
              new[1] = ((ysize - 20)
                        - ((((unsigned long long int) (ysize - 40))
                            * entry.stack) / maxsize_stack));
              gdImageLine (im_out, last_xpos, last_stack, xpos, new[1],
                           green);
              last_stack = new[1];
            }

          last_xpos = xpos;
        }
    }

  /* Write out the result.  */
  outfile = fopen (outname, "w");
  if (outfile == NULL)
    error (EXIT_FAILURE, errno, "cannot open output file");

  gdImagePng (im_out, outfile);

  fclose (outfile);

  gdImageDestroy (im_out);

  return 0;
}


/* Handle program arguments.  */
static error_t
parse_opt (int key, char *arg, struct argp_state *state)
{
  switch (key)
    {
    case 'o':
      outname = arg;
      break;
    case 's':
      string = arg;
      break;
    case 't':
      time_based = 1;
      break;
    case 'T':
      also_total = 1;
      break;
    case 'x':
      xsize = atoi (arg);
      if (xsize == 0)
        xsize = XSIZE;
      break;
    case 'y':
      ysize = atoi (arg);
      if (ysize == 0)
        ysize = XSIZE;
      break;
    default:
      return ARGP_ERR_UNKNOWN;
    }
  return 0;
}


static char *
more_help (int key, const char *text, void *input)
{
  char *tp;

  switch (key)
    {
    case ARGP_KEY_HELP_EXTRA:
      /* We print some extra information.  */
      if (asprintf (&tp, gettext ("\
For bug reporting instructions, please see:\n\
%s.\n"), REPORT_BUGS_TO) < 0)
        return NULL;

      return tp;

    default:
      break;
    }
  return (char *) text;
}

/* Print the version information.  */
static void
print_version (FILE *stream, struct argp_state *state)
{
  fprintf (stream, "memusagestat %s%s\n", PKGVERSION, VERSION);
  fprintf (stream, gettext ("\
Copyright (C) %s Free Software Foundation, Inc.\n\
This is free software; see the source for copying conditions.  There is NO\n\
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
"), "2023");
  fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper");
}