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  1. #include <string.h>
  2. #include <stdio.h>
  3.  
  4. char *trim(char *text) {
  5.     char *start = text; // points to the first character
  6.     char *end = text + strlen(text); // points past the last character
  7.  
  8.     // Let's start with the left side.
  9.     // Move the pointer as long as there's a whitespace
  10.     for (; isspace(*start); ++start);
  11.  
  12.     // In a similar way, let's get the right end.
  13.     // Again, move the pointer as long as there's a whitespace
  14.     for (;end > start && isspace(end[-1]); --end);
  15.  
  16.     // Insert the new terminator
  17.     *end = '\0';
  18.  
  19.     // Return the new starting offset
  20.     return start;
  21. }
  22.  
  23. int main(int argc, char **argv) {
  24.     char string[] = "  \t  Hello World\t\t\n";
  25.     printf("result: '%s'\n", trim(string));
  26.     return 0;
  27. }
  28.  
Success #stdin #stdout 0s 2052KB
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stdin
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Standard input is empty
stdout
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result: 'Hello World'
https://ideone.com/DwirSk
A simple function to trim a string of leading and trailing whitespaces.
language:
C (gcc 8.3)
created:
8 years ago
visibility:
secret

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