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Full Discussion: Building an argc/argv style structure from a string (char*)
Top Forums Programming Building an argc/argv style structure from a string (char*) Post 302380878 by jim mcnamara on Wednesday 16th of December 2009 12:27:00 PM
Old 12-16-2009
You need to parse your line of text into fields.

strtok() allows the use of multiple field delimiters. It has drawbacks, but you can call it
on a temporary string several times to get the field breakout you need.

You can also use lex/yacc to parse fields. An intermediate approach is to use the regex engine. See man regcmp and/or man regex.

Now - the obvious question - why can you not simply use argc, argv? ie., write a child process that is "called" with your string:

Code:
/* mychild.c */
#include <stdio.h>
int main( int argc, char **argv)
{
      int i=0;
      while(i<argc)
      {
           printf("argv[%d]=%s\n", i, argv[i++]);
       }
       printf("argc=%d\n", argc);
}

call your child code with popen -
Code:
void foo(char *stringtoparse)
{
char tmp[256]={0x0};
char cmdstr[256]={0x0};
FILE *cmd=NULL;

sprintf(cmdstr, "./mychild %s", stringtoparse);
cmd=popen(cmdstr, "r");
while(fgets(tmp, sizeof(tmp), cmd)!=NULL)
   printf("%s", tmp);
pclose(cmd);
}

Last edited by jim mcnamara; 12-16-2009 at 01:32 PM..
 

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LEARN ABOUT DEBIAN

aa_parseoptions

aa_parseoptions(3)					     Library Functions Manual						aa_parseoptions(3)

NAME

       aa_parseoptions - parse the standard command line options used by AA-lib.

SYNOPSIS

       #include <aalib.h>

       int aa_parseoptions
       (
	    struct aa_hardware_params *p,
	    aa_renderparams *r,
	    int *argc,
	    char **argv
       );

PARAMETERS

       struct aa_hardware_params *p
	      Hardware	parameters  structure to alter. It is expected that this structure only with necessary modifications will be later used to
	      initialize the AA-lib context.

       aa_renderparams *r
	      Rendering prameters structure to alter. It is expected that this structure only with necessary modifications will be later  used	to
	      render images.

       int *argc
	      Pointer to argc parameter passed to function "main".

       char **argv
	      Pointer to argv parameter passed to function "main".

DESCRIPTION

       Use  this  function to parse the standard command line options used by AA-lib. Every AA-lib program ought to call this function to let user
       specify some extra parameters.  The function alters the aa_hardware_params and aa_renderparams structures and removes  known  options  from
       the  argc/argv  lists. It also parse the AAOPTS environment variable.  When called with NULL for the argc/argv parameters, it parses AAOPTS
       only. At least this call ought to be in every AA-lib program.

RETURNS

       1 when sucesfull and 0 on failure. The program then can print the help text available in aa_help variable.

SEE ALSO

       save_d(3), mem_d(3),  aa_help(3),  aa_formats(3),  aa_fonts(3),	aa_dithernames(3),  aa_drivers(3),  aa_kbddrivers(3),  aa_mousedrivers(3),
       aa_kbdrecommended(3),	aa_mouserecommended(3),    aa_displayrecommended(3),   aa_defparams(3),   aa_defrenderparams(3),   aa_scrwidth(3),
       aa_scrheight(3), aa_mmwidth(3), aa_mmheight(3), aa_imgwidth(3), aa_imgheight(3), aa_image(3), aa_text(3),  aa_attrs(3),	aa_currentfont(3),
       aa_autoinit(3),	aa_autoinitkbd(3), aa_autoinitmouse(3), aa_recommendhi(3), aa_recommendlow(3), aa_init(3), aa_initkbd(3), aa_initmouse(3),
       aa_close(3), aa_uninitkbd(3), aa_uninitmouse(3), aa_fastrender(3), aa_render(3), aa_puts(3), aa_printf(3), aa_gotoxy(3),  aa_hidecursor(3),
       aa_showcursor(3),  aa_getmouse(3), aa_hidemouse(3), aa_showmouse(3), aa_registerfont(3), aa_setsupported(3), aa_setfont(3), aa_getevent(3),
       aa_getkey(3), aa_resize(3), aa_resizehandler(3), aa_edit(3), aa_createedit(3), aa_editkey(3), aa_putpixel(3), aa_recommendhikbd(3), aa_rec-
       ommendlowkbd(3), aa_recommendhimouse(3), aa_recommendlowmouse(3), aa_recommendhidisplay(3), aa_recommendlowdisplay(3)

c2man aalib.h							 8 September 1999						aa_parseoptions(3)
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