W3C Sample Code Library libwww Generic String Management

# Generic String Management

    /*
    **	(c) COPYRIGHT MIT 1995.
    **	Please first read the full copyright statement in the file COPYRIGH.
    */

These functions provide functionality for case-independent string comparison and allocations with copies etc.

This module is implemented by HTString.c, and it is a part of the W3C Sample Code Library.

    #ifndef HTSTRING_H
    #define HTSTRING_H

## Dynamic String Manipulation

These two functions are dynamic versions of `strcpy` and `strcat`. They use `malloc` for allocating space for the string. If `StrAllocCopy` is called with a non-NULL dest, then this is freed before the new value is assigned so that only the last string created has to be freed by the user. If `StrAllocCat` is called with a NULL pointer as destination then it is equivalent to `StrAllocCopy`.

    #define StrAllocCopy(dest, src) HTSACopy (&(dest), src)
    #define StrAllocCat(dest, src)  HTSACat  (&(dest), src)

    extern char * HTSACopy (char **dest, const char *src);
    extern char * HTSACat  (char **dest, const char *src);

The next two functions take a variable number of strings and cats them together using dynamic memory. This is basically like a simple form for sprintf where the only argument is `char *`. One day we should turn this into a real dynamic `sprintf()`.

    extern char * StrAllocMCopy (char ** dest, ...);
    extern char * StrAllocMCat (char ** dest, ...);

The last argument MUST be NULL as we otherwise don't know when the argument list stops.

## Case-insensitive String Comparison

The usual routines (comp instead of cmp) had some problem.

    extern int strcasecomp  (const char *a, const char *b);
    extern int strncasecomp (const char *a, const char *b, int n);

## Tail String Comparison

Like strcmp, but match the tail of s2 (used for cookie domain comparison)

    extern int tailcomp(const char * s1, const char * s2);
    extern int tailcasecomp(const char * s1, const char * s2);

## String Comparison with Wild Card Match

String comparison function for file names with one wildcard * in the template. Arguments are:

tmpl
  is a template string to match the name against. agaist, may contain a single wildcard character * which matches zero or more arbitrary characters.
name
  is the name to be matched agaist the template.

Returns empty string ("") if perfect match, pointer to part matched by wildcard if any, or NULL if no match. This is basically the same as YES if match, else NO.

    extern char * HTStrMatch	(const char * tmpl, const char * name);
    extern char * HTStrCaseMatch	(const char * tmpl, const char * name);

## Case-insensitive strstr

This works like `strstr()` but is not case-sensitive.

    extern char * HTStrCaseStr (char * s1, char * s2);

## Strip white space off a string

Return value points to first non-white character, or to '/0' if none. All trailing white space is OVERWRITTEN with zero.

    extern char * HTStrip (char * s);

    #endif /* !HTSTRING_H */