WebSVN – wimsdev – Blame – /trunk/wims/src/mathml.c

Rev	Author	Line No.	Line
5522	bpr	1	/* Copyright (C) 2012 WIMSDEV
		2	* This file is part of the WIMS package.
		3	*
		4	* This program is free software; you can redistribute it and/or modify
		5	* it under the terms of the GNU General Public License as published by
		6	* the Free Software Foundation; either version 2 of the License, or
		7	* (at your option) any later version.
		8	*
		9	* This program is distributed in the hope that it will be useful,
		10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		12	* GNU General Public License for more details.
		13	*
		14	* You should have received a copy of the GNU General Public License
		15	* along with this program; if not, write to the Free Software
		16	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
		17	*/
		18
		19	int mathml(char *p, int option ){
		20	if (strlen(p)==0) return 1 ;
		21	if( mathalign_base <= 1){
		22	internal_error(" why is wims trying mathml()?\n");
		23	return 0; // got to insmath with gifs
		24	}
		25	if(strlen(p) > MAX_LINELEN ){ // too big ? probably too big for gifs as well ; but error signalling is better in gif-methods
		26	mathalign_base = 1;// 0 or 1 position of tex_gifs
		27	return 0; // got to insmath with gifs
		28	}
		29	//singlespace(p); // needed for check unbalanced \left\right in wims_mathml.cc --> insmath.c
		30	singlespace(p);
		31	int my_pipe[2];
		32	pid_t pid;
		33	if(pipe(my_pipe)){// pipe could not be opened...
		34	internal_error("mathml(): pipe() failure.\n");
		35	mathalign_base = 1;
		36	return 0; // got to insmath with gifs
		37	}
		38	else
		39	{
		40	pid = fork();
		41	if (pid == (pid_t) 0){
		42	// this buffer should probably be set to 0.5 * MAX_LINELEN : mathml is very big !
		43	// if output mathml string larger ;ERROR will be signaled by wims_matml.
		44	char mml_buffer[MAX_LINELEN+1];
		45	sprintf(mml_buffer, "%d", MAX_LINELEN);// int --> char
		46	// setting --tex-size argument to wims_mathml.cc
		47	char mathml_tex_size[64];//this should be a string like "250%"
		48	int texsize_list[]={5,10,20,50,75,100,120,130,150,180,220,300};
		49	// analogue to mathfonts.c but now we talk % and we could make any amount of changes
		50	// not limited by font-size !!
		51	int idx = 6;
		52	int use_js_zoom = 0; // default js-zoom in mathml if disabled
		53	// enable via adm/light
		54	// next code is stolen from wims.c
		55	if(getvar("useropts") != NULL \|\| getvar("wims_useropts") != NULL){
		56	char *u;
		57	u = getvar("useropts"); // set via adm/light or via cookie?
		58	if(u == NULL \|\| *u == 0){ u=getvar("wims_useropts");} // wims_user? look into def file
		59	if(u != NULL && *u != 0){
		60	if(myisdigit(u[0])){ //2 digit code : 12,22,32,...,92 [tex_size mathalignbase]
		61	idx = u[0] - '0';
		62	if(idx < 0 \|\| idx > 11){ idx = 6; } // the default value 120%
		63	}
		64	if(myisdigit(u[2]) && u[2]!=0){ // suppose we add 0 or 1 to useropts for using js-zoom on mathml?
		65	// 3 digitcode: 621 == fontsize idx=6 & use mathml & use zoom
		66	use_js_zoom = u[2] - '0';
		67	if(use_js_zoom > 1 \|\| use_js_zoom < 0){
		68	use_js_zoom = 0; //disable js-zooming of mathml
		69	}
		70	}
		71	}
		72	}
		73	else
		74	{ // we take the default setting from adm/management config
		75	idx = atoi(getvar("wims_texbasesize")) ;
		76	if(idx < 0 \|\| idx > 11){ idx = 6; } // the default value 120%
		77	}
		78	// now write the "char" 200% into variable "mathml_tex_size"
		79	snprintf(mathml_tex_size,sizeof(mathml_tex_size),"%d%%",texsize_list[idx]);
		80	// int --> char : added % sign (needed for mathml) [%% = escaped %]
		81	if(mathml_tex_size == NULL \|\| strlen(mathml_tex_size) == 0 ){ // this should not happen
		82	sprintf(mathml_tex_size,"%s","120%");
		83	// if it goes wrong we set 120%
		84	// default in itex2MML was 110% : but we thought it was too small... ?
		85	}
		86	char zoom[2];
		87	snprintf(zoom, 2 ,"%d",use_js_zoom);// int --> char : "0" or "1"
		88	char *argv[]={"wims_mathml","--use-zoom",zoom,"--tex-size",mathml_tex_size,"--max-mml-size",mml_buffer,"--tex-string",p,NULL};
		89	/* This is the child process. Close other end first. */
		90	close(my_pipe[0]);
		91	dup2(my_pipe[1], 1); // send stdout to the pipe
		92	dup2(my_pipe[1], 2); // send stderr to the pipe
		93	close(my_pipe[1]);
		94	execv("../bin/wims_mathml",argv);
		95	internal_error("could not execute wims_mathml\n");
		96	mathalign_base = 1;
		97	return 0; // got to insmath with gifs
		98	}
		99	else
		100	{
		101	if (pid < (pid_t) 0){
		102	close(my_pipe[0]); // close the read end of the pipe in the parent
		103	close(my_pipe[1]); // close the write end of the pipe in the parent
		104	internal_error("mathml(): fork() failure.\n");
		105	mathalign_base = 1;
		106	return 0; // got to insmath with gifs
		107	}
		108	else
		109	{
		110	FILE *stream;
		111	close(my_pipe[1]); // close the write end of the pipe in the parent
		112	stream = fdopen (my_pipe[0], "r");
		113	char buffer[MAX_LINELEN+1];
		114	// make buffer filled with 'zero/null'
		115	memset(buffer,'\0',MAX_LINELEN);//bzero(buffer,maxsize);
		116	/* read output from program line by line*/
		117	if (option == 1) {
		118	*p=0;
		119	while ( fgets(buffer, MAX_LINELEN, stream) != NULL ){
		120	if(strcmp(buffer,"ERROR") != 0){
		121	mystrncpy(p, buffer, MAX_LINELEN-1);
		122	}
		123	}
		124	}
		125	else
		126	{
		127	while ( fgets(buffer, MAX_LINELEN, stream) != NULL ){
		128	if(strcmp(buffer,"ERROR") != 0){
		129	output("%s", buffer);
		130	}
		131	}
		132	}
		133	fclose (stream);
		134	close(my_pipe[0]);
		135	int status;
		136	waitpid(pid, &status, 0);
		137	}
		138	}
		139	}
		140	return 1;
		141	}

Subversion Repositories wimsdev

(root)/trunk/wims/src/mathml.c – Rev 5522