Extracting string from char array specified by prefix and suffix

by

the following proposed code:

  1. assumes that the ‘output[]’ array is long enough to hold the result+1
  2. assumes that the ‘output[]’ is not to include the strings ‘start[]’ nor ‘end[]’

Caveat: this is not tested

Caveat: the resulting char array in ‘output[]’ is not NUL terminated so the calling code (probably) should pre initialize that array to all ‘\0’

void extract_string(char input[], char output[], char start[], end[])
{
    char *startPos = strstr( input, start );
    if( !startPos )
    {
        fprintf( stderr, " %s not found in %s\n", start, input );
        return;
    }

    startPos += strlen( start );

    char *stopPos = strstr( startPos, end );
    if( !stopPos )
    {
        fprintf( stderr, " %s not found in %s\n", end, startPos );
        return;
    }

    memcpy( output, startPos, stopPos - startPos +1 );
} // end function: extract_string

More Related Contents:

  1. How to know the do while loop in C programming [closed]
  2. C modify global char array [closed]
  3. Semicolon and Comma in C [closed]
  4. Fast way to tokenize a string in c
  5. Find the highest order bit in C [duplicate]
  6. Connecting n commands with pipes in a shell?
  7. Modifying C string constants? [duplicate]
  8. When to use earlyclobber constraint in extended GCC inline assembly?
  9. Remove spaces from a string in C
  10. Read no more than size of string with scanf()
  11. srand(time(NULL)) doesn’t change seed value quick enough [duplicate]
  12. Get a timestamp in C in microseconds?
  13. Input in C. Scanf before gets. Problem
  14. Recursive declaration of function pointer in C
  15. Type to use to represent a byte in ANSI (C89/90) C?
  16. Confusion regarding modification of const variable using pointers
  17. Macro to count number of arguments
  18. How to check if a pointer is valid? [duplicate]
  19. Calling a script from a setuid root C program – script does not run as root
  20. C Macros to create strings
  21. Why does a=(b++) have the same behavior as a=b++?
  22. How do I use setsockopt(SO_REUSEADDR)?
  23. What is Indeterminate value?
  24. Why can we not declare a variable after a switch case colon without using curly braces?
  25. Using getchar() in a while loop
  26. Is it possible to print out only a certain section of a C-string, without making a separate substring?
  27. Check if process exists given its pid
  28. flock(): removing locked file without race condition?
  29. How to make YY_INPUT point to a string rather than stdin in Lex & Yacc (Solaris)
  30. What API do I call to get the system uptime?

Leave a Comment