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Remove trailing blanks from files

/ Published in: C
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Simple prog for removing trailing blanks. Not for use with binary, compressed, or encoded files. Please make backups of your files.

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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <windows.h>
  4.  
  5. char*mytmpfile="notrail.tmp";
  6.  
  7. void err(char*text){
  8.  if(!text)text="Can't open file";
  9.  MessageBox(
  10.   0,
  11.   text,
  12.   "NoTrail Error",
  13.   MB_ICONERROR | MB_OK
  14.  );
  15.  exit(1);
  16. }
  17.  
  18.  
  19. static inline void replace(char*s){
  20.  remove(s);
  21.  rename(mytmpfile,s);
  22. }
  23.  
  24.  
  25. static inline void notrail(char*filename){
  26.  FILE*i,*o;
  27.  unsigned long int saved=0;
  28.  unsigned long int n;
  29.  int c;
  30.  int b;
  31.  i=fopen(filename,"rt");
  32.  if(!i)err(0);
  33.  o=fopen(mytmpfile,"wt");
  34.  if(!o)err(0);
  35.  do{
  36.   c=getc(i);
  37.   if(c==EOF)break;
  38.   if(c==32){
  39.    n=1;
  40.    while((c=getc(i))==32)++n;
  41.    if(c!='\n'&&c!=EOF){
  42.     do putc(' ',o);
  43.     while(--n);
  44.    }else saved+=n;
  45.   }
  46.   b=c!=EOF;
  47.   if(b)putc(c,o);
  48.  }while(b);
  49.  fclose(o);
  50.  fclose(i);
  51.  if(saved){
  52.   char text[32];
  53.   sprintf(text,"Saved %lu bytes\n",saved);
  54.   n=MessageBox(
  55.    0,
  56.    text,
  57.    filename,
  58.    MB_ICONASTERISK | MB_OKCANCEL
  59.   );
  60.   if(n==IDOK){
  61.    replace(filename);
  62.    return;
  63.   }
  64.  }
  65.  remove(mytmpfile);
  66. }
  67.  
  68.  
  69. int main(int argc,char**argv){
  70.  if(argc<2){
  71.   MessageBox(
  72.    0,
  73.    "Removes trailing blanks. To use, close this"
  74.    " window and drag and drop one or more"
  75.    " files onto the program's icon.",
  76.    "NoTrail by Zufolek 2009",
  77.    MB_ICONINFORMATION | MB_OK
  78.   );
  79.   return 0;
  80.  }
  81.  while(--argc)notrail(*++argv);
  82.  return 0;
  83. }

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