qse/qse/samples/sed/sed03.c

#include <qse/sed/stdsed.h>
#include <qse/cmn/main.h>
#include <qse/cmn/sio.h>
#include "sed00.h"

static void trace_exec (qse_sed_t* sed, qse_sed_tracer_op_t op, qse_sed_cmd_t* cmd)
{
	qse_xstr_t h, p;

	qse_sed_getspace (sed, QSE_SED_SPACE_HOLD, &h);
	qse_sed_getspace (sed, QSE_SED_SPACE_PATTERN, &p);

	/* print the contents of the hold space and the pattern space
	 * at each phase of execution */
	qse_printf (QSE_T("HOLD: [%.*s] PATTERN: [%.*s]\n"), (int)h.len, h.ptr, (int)p.len, p.ptr);
}

static int sed_main (int argc, qse_char_t* argv[])
{
	qse_sed_t* sed = QSE_NULL;
	qse_sed_iostd_t in[2];
	qse_sed_iostd_t out;
	int ret = -1;

	/* create the sed object */
	sed = qse_sed_openstd (0);
	if (sed == QSE_NULL)  
	{
		qse_fprintf (QSE_STDERR, QSE_T("ERROR: cannot open sed\n"));
		goto oops;
	}

	/* compile the command string */
	if (qse_sed_compstdstr (sed, QSE_T("s/abc/def/g; s/def/kkk/g")) <= -1)
	{
		qse_fprintf (QSE_STDERR, QSE_T("ERROR: %s\n"), qse_sed_geterrmsg(sed));
		goto oops;
	}

	/* arrange to use the second argument as input data */
	in[0].type = QSE_SED_IOSTD_STR;
	in[0].u.str.ptr = QSE_T("ABCDEFGHI abcdefghi abcdefghi\nhigh abc dom\n");
	in[0].u.str.len = qse_strlen (in[0].u.str.ptr);
	in[1].type = QSE_SED_IOSTD_NULL;

	/* indicate that the output should be placed in a 
	 * dynamically allocated memory chunk */
	out.type = QSE_SED_IOSTD_STR;

	/* squeeze in a tracing hook */
	qse_sed_setopt (sed, QSE_SED_TRACER, trace_exec);

	/* execute the compiled command */
	if (qse_sed_execstd (sed, in, &out) <= -1)
	{
		qse_fprintf (QSE_STDERR, QSE_T("ERROR: %s\n"), qse_sed_geterrmsg(sed));
		goto oops;
	}

	/* access the output data produced */
	qse_printf (QSE_T("%.*s\n"), (int)out.u.str.len, out.u.str.ptr);

	/* free the output data */
	qse_sed_freemem (sed, out.u.str.ptr);	

oops:
	/* destroy the sed object */
	if (sed) qse_sed_close (sed);
	return ret;
}

int qse_main (int argc, qse_achar_t* argv[])
{
	int x;
	qse_openstdsios ();
	init_sed_sample_locale ();
	x = qse_runmain (argc, argv, sed_main);
	qse_closestdsios ();
	return x;
}