ao_string_tokenize - tokenize an input string


#include <your-opts.h>
cc [...] -o outfile infile.c -lopts [...]

token_list_t* ao_string_tokenize(char const* string);


This function will convert one input string into a list of strings. The list of strings is derived by separating the input based on white space separation. However, if the input contains either single or double quote characters, then the text after that character up to a matching quote will become the string in the list.

The returned pointer should be deallocated with free(3C) when are done using the data. The data are placed in a single block of allocated memory. Do not deallocate individual token/strings.

The structure pointed to will contain at least these two fields:

tkn_ct The number of tokens found in the input string.

tok_list An array of tkn_ct + 1 pointers to substring tokens, with the last pointer set to NULL.

There are two types of quoted strings: single quoted () and double quoted ("). Singly quoted strings are fairly raw in that escape characters (\) are simply another character, except when preceding the following characters:
double backslashes reduce to one
incorporates the single quote into the string
0fP suppresses both the backslash and newline character

Double quote strings are formed according to the rules of string constants in ANSI-C programs.


string to be tokenized


pointer to a structure that lists each token


NULL is returned and errno will be set to indicate the problem:

EINVAL − There was an unterminated quoted string.

ENOENT − The input string was empty.

ENOMEM − There is not enough memory. @end itemize


#include <stdlib.h>
int ix;
token_list_t* ptl = ao_string_tokenize(some_string)
for (ix = 0; ix < ptl->tkn_ct; ix++)
Note that everything is freed with the one call to free(3C).


The info documentation for the -lopts library.
configFileLoad(3), optionFileLoad(3), optionFindNextValue(3), optionFindValue(3), optionFree(3), optionGetValue(3), optionLoadLine(3), optionMemberList(3), optionNextValue(3), optionOnlyUsage(3), optionProcess(3), optionRestore(3), optionSaveFile(3), optionSaveState(3), optionUnloadNested(3), optionVersion(3), strequate(3), streqvcmp(3), streqvmap(3), strneqvcmp(3), strtransform(3),


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.