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Centered Printf

A printf() type of function used to center text on an 80 character width display.

Submitted By: NickDMax
Actions:
Rating:
Views: 63

Language: C
Last Modified: August 6, 2008
Instructions: You will need to include the following headers: stdio.h, stdarg.h, string.h.

Snippet


  1. #include <stdio.h>
  2. #include <stdarg.h>
  3. #include <string.h>
  4.  
  5. int centerPrintf(const char *format, ...);
  6.  
  7. int main() {
  8.         centerPrintf("--- %s ----", "PROGRAM TITLE");
  9.         getchar();
  10.         return 0;
  11. }
  12.  
  13. /**
  14. *  centerPrintf(const char *format, ...) -- used to center text on the screen.
  15. *  Compatible with standard printf() type statements, but to the center the
  16. *     text the length of the text must be less than 80 chars. To try to ensure
  17. *     this the format text is limited to 70 characters. However it is left up
  18. *     to the user to ensure that the formatted text will be less than 80 chars.
  19. *   
  20. */
  21. int centerPrintf(const char *format, ...)
  22. {
  23.     char buffer[81];
  24.     char myformat[81];
  25.     char *ptr = myformat;
  26.     int len; //used to tell how much of the buffer was used.
  27.     int spaces;
  28.     va_list args; //the argument list
  29.     va_start (args, format); //set up the argument list to be passed to vsprintf()
  30.     len = strlen(format);
  31.     if (len < 70) {
  32.             //This is how we can pass along our argument list using
  33.             // the vsprintf function.
  34.             len = vsprintf (buffer, format, args);
  35.             spaces = 40 - len/2;
  36.             len += spaces;
  37.             //Sort of a check
  38.             if (len < 80) {
  39.                while (spaces--) { *ptr++ = 0x20; }
  40.                ++spaces;
  41.                while (buffer[spaces]) { *ptr++ = buffer[spaces++];  }
  42.                *ptr = 0x00;
  43.                puts(myformat);
  44.             } else {
  45.                  len = 0;
  46.             }
  47.     } else {
  48.         len = 0; //if there is no room then don't do it.
  49.     }
  50.     va_end (args);
  51.     return len; //number of characters that we needed
  52. }
  53.  

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