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Top Forums Programming Help on digestion of C header files for a short program. Post 302837289 by yifangt on Thursday 25th of July 2013 01:12:33 PM
Old 07-25-2013
I have some unclear catch for the following lines in the "khash.h" file:
Code:
#ifndef __AC_KHASH_H
#define __AC_KHASH_H
#define AC_VERSION_KHASH_H "0.2.6"

I understand #ifndef and #ifdef to avoid redundant inclusion of the headers/definition etc, but not sure the rules to name the content (here the __AC_KHASH_H) as I was recommended capitalized file name KHASH_H or __KHASH_H in general because the file is "khash.h". The author used __AC_KHASH_H. It seems to me anything is fine once it is unique. Did I miss anything? My unclear parts are:
1) What are the rules to name the content of #ifndefine, if any, in general for software developer?
2) Here AC_VERSION_KHASH_H "0.2.6" seems does not impact the program but for version record of the code, is this correct?
Thank you!

Last edited by yifangt; 07-25-2013 at 02:13 PM.. Reason: typo
 

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LIBXO(3)						   BSD Library Functions Manual 						  LIBXO(3)

NAME
xo_emit -- emit formatted output based on format string and arguments LIBRARY
library ``libxo'' SYNOPSIS
#include <libxo/xo.h> xo_handle_t * xo_create(unsigned style, unsigned flags); xo_handle_t * xo_create_to_file(FILE *fp, unsigned style, unsigned flags); void xo_destroy(xo_handle_t *handle); DESCRIPTION
A libxo handle can be allocated using the xo_create() function. Example: xo_handle_t *xop = xo_create(XO_STYLE_JSON, XOF_WARN); .... xo_emit_h(xop, "testing0); By default, libxo writes output to standard output. A convenience function is provided for situations when output should be written to a different file. Use the XOF_CLOSE_FP flag to trigger a call to fclose(3) for the FILE pointer when the handle is destroyed. The xo_destroy() function releases a handle and any resources it is using. Calling xo_destroy() with a NULL handle will release any resources associated with the default handle. ADDITIONAL DOCUMENTATION
Complete documentation can be found on github: http://juniper.github.io/libxo/libxo-manual.html libxo lives on github as: https://github.com/Juniper/libxo The latest release of libxo is available at: https://github.com/Juniper/libxo/releases SEE ALSO
xo_emit(3), xo_set_options(3) HISTORY
The libxo library was added in FreeBSD 11.0. AUTHOR
Phil Shafer BSD
December 4, 2014 BSD
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