nuttx-apps/system/inifile/README.txt

README.txt
==========

Syntax
======

  This directory contains a very simple INI file parser.  An INI file consists
  of a sequence of lines up to the end of file.  A line may be one of the
  following:

    1) A blank line.

    2) A comment line.  Any line beginning with ';'

    3) A section header.  Definitions are divided into sections.  Each
       section begins with a line containing the section name enclosed in
       square brackets.  For example, "[section1]".  The left bracket must
       be the first character on the line.  Section names are case
       insensitive, i.e., "SECTION1" and "Section1" refer to the same
       section.

    4) Variable assignments.  A variable assignment is a variable name
       followed by the '=' sign and then the value of the variable.  For
       example, "A=B": "A" is the variable name; "B" is the variable value.
       All variables following the section header belong in the section.

       Variable names may be preceded with white space. Whitespace is not
       permitted before the '=' sign.  Variable names are case insensitive,
       i.e., "A" and "a" refer to the same variable name.

       Variable values may be numeric (any base) or a string.  The case of
       string arguments is preserved.

Programming Interfaces
======================

  See apps/include/inifile.h for interfaces supported by the INI file parser.

Test Program
============

  Below is a simple test program:

int main(int argc, char *argv[])
{
  INIHANDLE handle;
  FILE *stream;
  FAR char *ptr;
  long value;

  stream = fopen("/tmp/file.ini", "w");
  fprintf(stream, "; Test INI file\n");
  fprintf(stream, "[section1]\n");
  fprintf(stream, "  VAR1=1\n");
  fprintf(stream, "  VAR2=2\n");
  fprintf(stream, "  VAR3=3\n");
  fprintf(stream, "\n");
  fprintf(stream, "[section2]\n");
  fprintf(stream, "  VAR4=4\n");
  fprintf(stream, "  VAR5=5\n");
  fprintf(stream,   "VAR6=6\n");
  fprintf(stream, "\n");
  fclose(stream);

  handle = inifile_initialize("/tmp/file.ini");

  ptr = inifile_read_string(handle, "section2", "VAR5", "OOPS");
  printf("Section: %s Variable: %s String: %s\n", "section2", "VAR5", ptr);
  inifile_free_string(ptr);

  ptr = inifile_read_string(handle, "section1", "VAR2", "OOPS");
  printf("Section: %s Variable: %s String: %s\n", "section1", "VAR2", ptr);
  inifile_free_string(ptr);

  ptr = inifile_read_string(handle, "section3", "VAR3", "OOPS");
  printf("Section: %s Variable: %s String: %s\n", "section3", "VAR3", ptr);
  inifile_free_string(ptr);

  ptr = inifile_read_string(handle, "section1", "VAR3", "OOPS");
  printf("Section: %s Variable: %s String: %s\n", "section1", "VAR3", ptr);
  inifile_free_string(ptr);

  ptr = inifile_read_string(handle, "section1", "VAR1", "OOPS");
  printf("Section: %s Variable: %s String: %s\n", "section1", "VAR1", ptr);
  inifile_free_string(ptr);

  ptr = inifile_read_string(handle, "section1", "VAR42", "OOPS");
  printf("Section: %s Variable: %s String: %s\n", "section1", "VAR42", ptr);
  inifile_free_string(ptr);

  ptr = inifile_read_string(handle, "section2", "VAR6", "OOPS");
  printf("Section: %s Variable: %s String: %s\n", "section2", "VAR6", ptr);
  inifile_free_string(ptr);

  ptr = inifile_read_string(handle, "section2", "VAR4", "OOPS");
  printf("Section: %s Variable: %s String: %s\n", "section2", "VAR4", ptr);
  inifile_free_string(ptr);

  value = inifile_read_integer(handle, "section1", "VAR3", 0);
  printf("Section: %s Variable: %s Value: %ld\n", "section1", "VAR3", value);

  value = inifile_read_integer(handle, "section3", "VAR3", 0);
  printf("Section: %s Variable: %s String: %ld\n", "section3", "VAR3", value);

  value = inifile_read_integer(handle, "section1", "VAR1", 0);
  printf("Section: %s Variable: %s Value: %ld\n", "section1", "VAR1", value);

  value = inifile_read_integer(handle, "section2", "VAR5", 0);
  printf("Section: %s Variable: %s Value: %ld\n", "section2", "VAR5", value);

  value = inifile_read_integer(handle, "section2", "VAR6", 0);
  printf("Section: %s Variable: %s Value: %ld\n", "section2", "VAR6", value);

  value = inifile_read_integer(handle, "section1", "VAR42", 0);
  printf("Section: %s Variable: %s String: %ld\n", "section1", "VAR42", value);

  value = inifile_read_integer(handle, "section1", "VAR2", 0);
  printf("Section: %s Variable: %s Value: %ld\n", "section1", "VAR2", value);

  value = inifile_read_integer(handle, "section2", "VAR4", 0);
  printf("Section: %s Variable: %s Value: %ld\n", "section2", "VAR4", value);

  inifile_uninitialize(handle);
  return 0;
}

Test program output:

Section: section2 Variable: VAR5 String: 5
Section: section1 Variable: VAR2 String: 2
Section: section3 Variable: VAR3 String: OOPS
Section: section1 Variable: VAR3 String: 3
Section: section1 Variable: VAR1 String: 1
Section: section1 Variable: VAR42 String: OOPS
Section: section2 Variable: VAR6 String: 6
Section: section2 Variable: VAR4 String: 4

Section: section1 Variable: VAR3 Value: 3
Section: section3 Variable: VAR3 Value: 0
Section: section1 Variable: VAR1 Value: 1
Section: section2 Variable: VAR5 Value: 5
Section: section2 Variable: VAR6 Value: 6
Section: section1 Variable: VAR42 String: 0
Section: section1 Variable: VAR2 Value: 2
Section: section2 Variable: VAR4 Value: 4