Reusable librock_HTTP_astrSetFieldUrlEncode - replace the value for a field in an URL-encoded query string

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NAME

librock_HTTP_astrSetFieldUrlEncode - replace the value for a field in an URL-encoded query string

#License - #Source code - #Example Use -

SYNOPSIS

#include <librock/html.h>

char *
librock_HTTP_astrSetFieldUrlEncode(
    char **ppaszQueryString,
    const char *pszName,
    const char *pszValue
);

DESCRIPTION

Locate the first occurrence of the named field in the encoded query string, and replace the value. If does not occur, append to the query string.

Returns *ppasz.

To determine if URL-encoding or Value-Encoding is more appropriate consider what will be decoding the string first.

There is no way to ValueEncode a '&' in an anchor HREF hyperlink. (See the note in RFC1866 8.2.1. Any '&' will be taken as a field separator.) Using & works usually.

Typical use is to modify an existing query string, or build one up from scratch. If field names are duplicated, use librock_HTTP_astrcatUrlEncode. This function will only modify the first matching field name.

#ifdef librock_TYPICAL_USE_HTTP_astrSetFieldUrlEncode
    char *asz = 0;
    librock_astrcpy(&asz,"file=some+value&file=not+replaced+value");
    librock_HTTP_astrSetFieldUrlEncode(&asz,"file","index.html");
    printf("%s\n",asz);
    librock_astrfree(&asz);
#endif

USES

  strlen() strncmp() strchr()
  librock_HTTP_astrcatUrlEncode()
  librock_astrcat() librock_astrn0cpy() librock_astrfree()
  librock_counttoch()

LICENSE

  Copyright 1998-2002 Forrest J. Cavalier III, http://www.mibsoftware.com
  Licensed under BSD-ish license, NO WARRANTY. Copies must retain this block.
  License text in <librock/license/librock.txt> librock_LIDESC_HC=12440211096131f5976d36be0cddca4cd9152e45

Source Code

./spec/infotool/www/html.c (implementation, plus source of this manual page)

Tests and Supported Platform Types

This is a representative sample. Librock code is highly portable. For a particular platform not reported here, request paid support

librock_HTTP_astrSetFieldUrlEncode passed tests in thtml (Unix/Linux/BSD: 2002/08/08 sys=FreeBSD using gcc)
librock_HTTP_astrSetFieldUrlEncode passed tests in thtml (WIN32: 2002/08/08 sys=NT 4.0 using MSVC)

This software is part of Librock

Rapid reuse, without rework.

Source code which is Open-source, Free (Libre) and free (no cost)
Namespace limited. All compile-time macros and names visible at link time are prefixed by "librock_". Integrate into your project and expect no name collisions.
Stable API means new functions get new names so that there is no risk that updating a source file will break existing applications.
Highly portable, cross-platform, and multithread compatible. Works with many machines, compilers, and operating systems (gcc/MSVC/Windows/Linux/BSD).

Details

Verbatim copying and distribution of this generated page is permitted in any medium provided that no changes are made.
(The source of this manual page may be covered by a more permissive license which allows modifications.)

Want to help? We welcome comments, patches. -- Need help? Request paid support.