util.c

/* ncdu - NCurses Disk Usage 
    
  Copyright (c) 2007-2010 Yoran Heling

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:
  
  The above copyright notice and this permission notice shall be included
  in all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

#include "util.h"

#include <string.h>
#include <stdlib.h>
#include <ncurses.h>

int winrows, wincols;
int subwinr, subwinc;

char cropstrdat[4096];
char formatsizedat[9]; /* "xxx.xMiB" */
char fullsizedat[20]; /* max: 999.999.999.999.999 */
char *getpathdat;
int getpathdatl = 0;

struct dir **links;
int linksl = 0, linkst = 0;


char *cropstr(const char *from, int s) {
  int i, j, o = strlen(from);
  if(o < s) {
    strcpy(cropstrdat, from);
    return cropstrdat;
  }
  j=s/2-3;
  for(i=0; i<j; i++)
    cropstrdat[i] = from[i];
  cropstrdat[i] = '.';
  cropstrdat[++i] = '.';
  cropstrdat[++i] = '.';
  j=o-s;
  while(++i<s)
    cropstrdat[i] = from[j+i];
  cropstrdat[s] = '\0';
  return cropstrdat;
}


char *formatsize(const off_t from) {
  float r = from; 
  char c = ' ';
  if(r < 1000.0f)      { }
  else if(r < 1023e3f) { c = 'k'; r/=1024.0f; }
  else if(r < 1023e6f) { c = 'M'; r/=1048576.0f; }
  else if(r < 1023e9f) { c = 'G'; r/=1073741824.0f; }
  else                 { c = 'T'; r/=1099511627776.0f; }
  sprintf(formatsizedat, "%5.1f%c%cB", r, c, c == ' ' ? ' ' : 'i');
  return formatsizedat;
}


char *fullsize(const off_t from) {
  char tmp[20];
  off_t n = from;
  int i, j;

  /* the K&R method - more portable than sprintf with %lld */
  i = 0;
  do {
    tmp[i++] = n % 10 + '0';
  } while((n /= 10) > 0);
  tmp[i] = '\0';

  /* reverse and add thousand seperators */
  j = 0;
  while(i--) {
    fullsizedat[j++] = tmp[i];
    if(i != 0 && i%3 == 0)
      fullsizedat[j++] = '.';
  }
  fullsizedat[j] = '\0';

  return fullsizedat;
}


int ncresize(int minrows, int mincols) {
  int ch;

  getmaxyx(stdscr, winrows, wincols);
  while((minrows && winrows < minrows) || (mincols && wincols < mincols)) {
    erase();
    mvaddstr(0, 0, "Warning: terminal too small,");
    mvaddstr(1, 1, "please either resize your terminal,");
    mvaddstr(2, 1, "press i to ignore, or press q to quit.");
    refresh();
    nodelay(stdscr, 0);
    ch = getch();
    getmaxyx(stdscr, winrows, wincols);
    if(ch == 'q') {
      erase();
      refresh();
      endwin();
      exit(0); 
    }
    if(ch == 'i')
      return 1;
  }
  erase();
  return 0;
}


void nccreate(int height, int width, char *title) {
  int i;

  subwinr = winrows/2-height/2;
  subwinc = wincols/2-width/2;

  /* clear window */
  for(i=0; i<height; i++)
    mvhline(subwinr+i, subwinc, ' ', width);

  /* box() only works around curses windows, so create our own */
  move(subwinr, subwinc);
  addch(ACS_ULCORNER);
  for(i=0; i<width-2; i++)
    addch(ACS_HLINE);
  addch(ACS_URCORNER);

  move(subwinr+height-1, subwinc);
  addch(ACS_LLCORNER);
  for(i=0; i<width-2; i++)
    addch(ACS_HLINE);
  addch(ACS_LRCORNER);

  mvvline(subwinr+1, subwinc, ACS_VLINE, height-2);
  mvvline(subwinr+1, subwinc+width-1, ACS_VLINE, height-2);

  /* title */
  attron(A_BOLD);
  mvaddstr(subwinr, subwinc+4, title);
  attroff(A_BOLD);
}


void ncprint(int r, int c, char *fmt, ...) {
  va_list arg;
  va_start(arg, fmt);
  move(subwinr+r, subwinc+c);
  vw_printw(stdscr, fmt, arg);
  va_end(arg);
}


/* removes item from the hlnk circular linked list and size counts of the parents */
void freedir_hlnk(struct dir *d) {
  struct dir *t, *par, *pt;
  int i;

  if(!(d->flags & FF_HLNKC))
    return;

  /* remove size from parents.
   * This works the same as with adding: only the parents in which THIS is the
   * only occurence of the hard link will be modified, if the same file still
   * exists within the parent it shouldn't get removed from the count.
   * XXX: Same note as for calc.c / calc_hlnk_check():
   *      this is probably not the most efficient algorithm */
  for(i=1,par=d->parent; i&&par; par=par->parent) {
    if(d->hlnk)
      for(t=d->hlnk; i&&t!=d; t=t->hlnk)
        for(pt=t->parent; i&&pt; pt=pt->parent)
          if(pt==par)
            i=0;
    if(i) {
      par->size -= d->size;
      par->asize -= d->asize;
    }
  }

  /* remove from hlnk */
  if(d->hlnk) {
    for(t=d->hlnk; t->hlnk!=d; t=t->hlnk)
      ;
    t->hlnk = d->hlnk;
  }
}


void freedir_rec(struct dir *dr) {
  struct dir *tmp, *tmp2;
  tmp2 = dr;
  while((tmp = tmp2) != NULL) {
    freedir_hlnk(tmp);
    /* remove item */
    if(tmp->sub) freedir_rec(tmp->sub);
    free(tmp->name);
    tmp2 = tmp->next;
    free(tmp);
  }
}


void freedir(struct dir *dr) {
  struct dir *tmp;

  /* free dr->sub recursively */
  if(dr->sub)
    freedir_rec(dr->sub);
 
  /* update references */
  if(dr->parent && dr->parent->sub == dr)
    dr->parent->sub = dr->next;
  if(dr->prev)
    dr->prev->next = dr->next;
  if(dr->next)
    dr->next->prev = dr->prev;

  freedir_hlnk(dr);

  /* update sizes of parent directories if this isn't a hard link.
   * If this is a hard link, freedir_hlnk() would have done so already */
  for(tmp=dr->parent; tmp; tmp=tmp->parent) {
    if(!(dr->flags & FF_HLNKC)) {
      tmp->size -= dr->size;
      tmp->asize -= dr->asize;
    }
    tmp->items -= dr->items+1;
  }

  free(dr->name);
  free(dr);
}


char *getpath(struct dir *cur) {
  struct dir *d, **list;
  int c, i;

  if(!cur->name[0])
    return "/";

  c = i = 1;
  for(d=cur; d!=NULL; d=d->parent) {
    i += strlen(d->name)+1;
    c++;
  }

  if(getpathdatl == 0) {
    getpathdatl = i;
    getpathdat = malloc(i);
  } else if(getpathdatl < i) {
    getpathdatl = i;
    getpathdat = realloc(getpathdat, i);
  }
  list = malloc(c*sizeof(struct dir *));

  c = 0;
  for(d=cur; d!=NULL; d=d->parent)
    list[c++] = d;

  getpathdat[0] = '\0';
  while(c--) {
    if(list[c]->parent)
      strcat(getpathdat, "/");
    strcat(getpathdat, list[c]->name);
  }
  free(list);
  return getpathdat;
}