gnuplot/docs/xref.c at e1c09e99ad1b0056036602f8de81ec0cf3a0a84e · gnuplot/gnuplot · GitHub

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* $Id: xref.c,v 1.9 1998/03/22 23:31:53 drd Exp $

/* GNUPLOT - xref.c */

/*[

* Permission to use, copy, and distribute this software and its

* documentation for any purpose with or without fee is hereby granted,

* provided that the above copyright notice appear in all copies and

* that both that copyright notice and this permission notice appear

* in supporting documentation.

* Permission to modify the software is granted, but not the right to

* distribute the complete modified source code. Modifications are to

* be distributed as patches to the released version. Permission to

* distribute binaries produced by compiling modified sources is granted,

* provided you

* 1. distribute the corresponding source modifications from the

* released version in the form of a patch file along with the binaries,

* 2. add special version identification to distinguish your version

* in addition to the base release version number,

* 3. provide your name and address as the primary contact for the

* support of your modified version, and

* 4. retain our contact information in regard to use of the base

* software.

* Permission to distribute the released version of the source code along

* with corresponding source modifications in the form of a patch file is

* granted with same provisions 2 through 4 for binary distributions.

* This software is provided "as is" without express or implied warranty

* to the extent permitted by applicable law.

]*/

* this file is included from doc2ipf, doc2html, doc2rtf and doc2info

* MUST be included after termdoc.c (since termdoc.c redefines fgets() )

* it contains functions needed to handle xrefs, most of them from

* doc2rtf (most likely) by Maurice Castro

* or doc2ipf by Roger Fearick

* or doc2html by Russel Lang

* I have modified the functions a little to make them more flexible

* (lookup returns list instead of list->line) or let them work with all

* four programs (adding three parameters to refs).

* I switched the search order of lookup. Makes more sense to me

* Stefan Bodewig 1/29/1996

struct LIST

{

int level;

int line;

char *string;

struct LIST *next;

struct LIST *prev;

};

struct LIST *list = NULL;

struct LIST *head = NULL;

struct LIST *keylist = NULL;

struct LIST *keyhead = NULL;

int maxlevel = 0; /* how deep are the topics nested? */

int listitems = 0; /* number of topics */

#if 0

/* none of these prototypes are required, since there are no

* forward calls made. Normally prototypes are fine, but because

* xmalloc defn depends on circumstances, compile failed on

* a non-ansi compiler I was using. [yes, I ought to come up with

* a better fix !]

void parse __PROTO((FILE *a));

struct LIST *lookup __PROTO((char*));

struct LIST *lkup_by_number __PROTO((int line));

void list_free __PROTO(());

void refs __PROTO((int l, FILE *f, char *start, char *end, char *format));

void *xmalloc __PROTO((size_t size));

#endif

/* for debugging (invoke from gdb !) */

void dump_list()

{

struct LIST *element = head;

while (element)

{

fprintf(stderr, "%p level %d, line %d, \"%s\"\n", element, element->level, element->line, element->string);

element = element->next;

}

#ifdef PROTOTYPES

void *xmalloc(size_t size)

{

void *p=malloc(size);

#else

char *xmalloc(size) /* think this is correct for K&R C */

unsigned int size;

{

char *p=malloc(size);

#endif

if (p)

return p;

fprintf(stderr, "Malloc failed\n");

exit(1);

return NULL; /* HBB 980317: kill superfluous warnings */

}

/* scan the file and build a list of line numbers where particular levels are */

void parse(a)

FILE *a;

{

static char line[MAX_LINE_LEN];

char *c;

int lineno=0;

int lastline=0;

/* insert a special level 0 listitem

* this one is the starting point for the table of contents in the html version

* and the Top-Node of the info version.

* Added this to support multiple level 1 items. --SB

listitems = 1;

head = (list = (struct LIST *) xmalloc(sizeof(struct LIST)));

list->prev = NULL;

list->line = 0;

list->level = 0;

/* I would prefer list->string = NULL, but don't know if free(NULL) is OK

* with all supported plattforms. */

list->string = (char *) xmalloc(1);

list->next = NULL;

while (fgets(line,MAX_LINE_LEN,a))

{

lineno++;

if (isdigit(line[0])) /* start of new section */

{

listitems++;

if (list == NULL) { /* impossible with the new level 0 item */

head = (list = (struct LIST *) xmalloc(sizeof(struct LIST)));

list->prev = NULL;

} else {

list->next = (struct LIST *) xmalloc(sizeof(struct LIST));

list->next->prev = list;

list = list->next;

list->next = NULL;

}

list->line = lastline = lineno;

list->level = line[0] - '0';

list->string = (char *) xmalloc (strlen(line)+1);

c = strtok(&(line[1]),"\n");

strcpy(list->string, c);

list->next = NULL;

if (list->level > maxlevel)

maxlevel = list->level;

}

if (line[0]=='?') /* keywords */

{

if (keylist == NULL) {

keyhead = (keylist = (struct LIST *) xmalloc(sizeof(struct LIST)));

keylist->prev = NULL;

} else {

keylist->next = (struct LIST *) xmalloc(sizeof(struct LIST));

keylist->next->prev = keylist;

keylist = keylist->next;

}

keylist->line = lastline;

keylist->level = list->level;

c = strtok(&(line[1]),"\n");

if( c == NULL || *c == '\0' ) c = list->string ;

keylist->string = (char *) malloc (strlen(c)+1);

strcpy(keylist->string, c);

keylist->next = NULL;

}

rewind(a);

}

/* look up a topic in text reference */

* Original version from doc2rtf (|| ipf || html) scanned keylist before list.

* This way we get a reference to `plot` for the topic `splot` instead

* of one to `splot`. Switched the search order -SB.

struct LIST *

lookup(s)

char *s;

{

char *c;

char tokstr[MAX_LINE_LEN];

char *match;

int l;

strcpy(tokstr, s);

/* first try titles */

match = strtok(tokstr, " \n\t");

if( match == NULL ) {

fprintf( stderr, "Error in lookup(\"%s\")\n", s ) ;

/* there should a line number, but it is local to parse() */

fprintf( stderr, "Possible missing link character (`) near above line number\n" ) ;

exit(3) ;

}

l = 0; /* level */

list = head;

while (list != NULL)

{

c = list->string;

while (isspace(*c)) c++;

if (!strcmp(match, c))

{

l = list->level;

match = strtok(NULL, "\n\t ");

if (match == NULL)

{

return(list);

}

if (l > list->level)

break;

list = list->next;

}

/* then try the ? keyword entries */

keylist = keyhead;

while (keylist != NULL)

{

c = keylist->string;

while (isspace(*c)) c++;

if (!strcmp(s, c)) return(keylist);

keylist = keylist->next;

}

return(NULL);

}

* find title-entry for keyword-entry

struct LIST *lkup_by_number(line)

int line;

{

struct LIST *run = head;

while (run->next && run->next->line <= line)

run = run->next;

if (run->next)

return run;

else

return NULL;

}

* free the whole list (I never trust the OS -SB)

void list_free __PROTO((void)) {

struct LIST *run;

for(run = head; run->next; run = run->next)

;

for(run = run->prev; run; run = run->prev) {

free(run->next->string);

free(run->next);

}

free(head->string);

free(head);

for(run = keyhead; run->next; run = run->next)

;

for(run = run->prev; run; run = run->prev) {

free(run->next->string);

free(run->next);

}

free(keyhead->string);

free(keyhead);

}

/* search through the list to find any references */

* writes a menu of all subtopics of the topic located at l

* format must contain %s for the title of the subtopic and may contain

* a %d for the line number of the subtopic (used by doc2html and doc2rtf

* The whole menu is preceeded by start and gets the trailer end

void

refs(l, f, start, end, format)

int l;

FILE *f;

char *start, *end, *format;

{

int curlevel, i;

char *c;

int inlist = FALSE;

/* find current line */

list = head;

while (list->line != l)

list = list->next;

curlevel = list->level;

list = list->next; /* look at next element before going on */

if (start != NULL && list != NULL) /* don't wrie start if there's no menue at all */

{

inlist = TRUE;

fprintf(f, "%s", start);

}

while (list != NULL)

{

/* we are onto the next topic so stop */

if (list->level == curlevel)

break;

/* these are the next topics down the list */

if (list->level == curlevel+1)

{

c = list->string;

while (isspace(*c)) c++; /* strip leading whitespace */

if (format != NULL) {

for (i=0; format[i] != '%' && format[i] != '\0'; i++)

;

if (format[i] != '\0')

if (format[i+1] == 'd') /* line number has to be printed first */

fprintf(f, format, list->line, c);

else {

++i;

for (; format[i] != '%' && format[i] != '\0'; i++)

;

if (format[i] != '\0') /* line number is second */

fprintf(f, format, c, list->line);

else /* no line number at all */

fprintf(f, format, c);

}

list = list->next;

}

if (inlist && end) /* trailer */

fprintf(f,"%s", end);

}

gnuplot/docs/xref.c at e1c09e99ad1b0056036602f8de81ec0cf3a0a84e · gnuplot/gnuplot · GitHub

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