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delete trailing spaces

zandyl asked
Last Modified: 2010-04-02
i have a table structure with 25 fields (all chars) and need to print them in a text format (csv).  i need to check each and every field data for null ('\0') and also delete their trailing spaces.  i tried using the for statement: for(x=0;x<(strlen(fld));x++) format but my code got so long because i kept repeating this statement and not exactly sure how to pass variables.  i'm writing this in SCO V platform.  could somebody please tell me how to make this work the easiest and simplest way possible.  some field data could have 3 or more words in it (like city) and i have to capture every character in it.  i really appreciate any help. thanks.

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What you would want to do would be to pass in a char string and count to the ending null terminator:

void trim_and_print(FILE *output, char *fld) {
  int i=0;
  int lastchar=0;
  static char buf[256]; // Just to save on stack space

  // Look for last non-space character
  while(fld[i]) {
    if(fld[i] != ' ') {
      lastchar = i + 1;

  if(lastchar > 0) {
   memcpy(buf, lastchar, fld);
   buf[lastchar] = '\0';
   sprintf(buf, "null");

  fprintf(output, "%s,", buf);

I haven't compiled or tested this code but it should give you an idea of what you need to do.


    #include <string.h>
    #include <ctype.h>

    void strip(char* str)
        char* p = str + strlen(str);
        while (--p >= str && isspace(*p))
        p[1] = 0;

what do you mean by trailing spaces???
and don't do for(x=0;x<(strlen(fld));x++)

or any other loop with the strlen func in it it's very stupid 'cause you execute this func every time you get in the for
you can execute it only one time
i mean do:
int len=strlen(fld)

it will be better

By calling strlen before the loop you're still going to loop through the string twice. If you're going to have to loop through the string anyway why even call strlen, just look for the \0 when looping through the string. That's all strlen going to do anyway.


thanks cookre....


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