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/*
* Copyright (c) 1995-2003 Silicon Graphics, Inc. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*/
/*
* Get help text from files built using newhelp
*/
#include "pmapi.h"
#include "impl.h"
#include "pmda.h"
#include <sys/stat.h>
typedef struct { /* beware: this data structure mirrored in chkhelp */
pmID pmid;
__uint32_t off_oneline;
__uint32_t off_text;
} help_idx_t;
typedef struct { /* beware: this data structure mirrored in chkhelp */
int dir_fd;
int pag_fd;
int numidx;
help_idx_t *index;
char *text;
int textlen;
} help_t;
static help_t *tab = NULL;
static int numhelp = 0;
/*
* open the help text files and return a handle on success
*/
int
pmdaOpenHelp(char *fname)
{
char pathname[MAXPATHLEN];
int sts, size;
help_idx_t hdr;
help_t *hp;
struct stat sbuf;
for (sts = 0; sts < numhelp; sts++) {
if (tab[sts].dir_fd == -1)
break;
}
if (sts == numhelp) {
sts = numhelp++;
tab = (help_t *)realloc(tab, numhelp * sizeof(tab[0]));
if (tab == NULL) {
__pmNoMem("pmdaOpenHelp", numhelp * sizeof(tab[0]), PM_RECOV_ERR);
numhelp = 0;
return -oserror();
}
}
hp = &tab[sts];
memset(hp, 0, sizeof(*hp));
hp->dir_fd = -1;
hp->pag_fd = -1;
snprintf(pathname, sizeof(pathname), "%s.dir", fname);
hp->dir_fd = open(pathname, O_RDONLY);
if (hp->dir_fd < 0) {
sts = -oserror();
goto failed;
}
if (read(hp->dir_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) {
sts = -EINVAL;
goto failed;
}
if (hdr.pmid != 0x50635068 ||
(hdr.off_oneline & 0xffff0000) != 0x31320000) {
sts = -EINVAL;
goto failed;
}
hp->numidx = hdr.off_text;
size = (hp->numidx + 1) * sizeof(help_idx_t);
hp->index = (help_idx_t *)__pmMemoryMap(hp->dir_fd, size, 0);
if (hp->index == NULL) {
sts = -oserror();
goto failed;
}
snprintf(pathname, sizeof(pathname), "%s.pag", fname);
hp->pag_fd = open(pathname, O_RDONLY);
if (hp->pag_fd < 0) {
sts = -oserror();
goto failed;
}
if (fstat(hp->pag_fd, &sbuf) < 0) {
sts = -oserror();
goto failed;
}
hp->textlen = (int)sbuf.st_size;
hp->text = (char *)__pmMemoryMap(hp->pag_fd, hp->textlen, 0);
if (hp->text == NULL) {
sts = -oserror();
goto failed;
}
return numhelp - 1;
failed:
pmdaCloseHelp(numhelp-1);
return sts;
}
/*
* retrieve pmID help text, ...
*
*/
char *
pmdaGetHelp(int handle, pmID pmid, int type)
{
int i;
help_t *hp;
if (handle < 0 || handle >= numhelp)
return NULL;
hp = &tab[handle];
/* search forwards -- could use binary chop */
for (i = 1; i <= hp->numidx; i++) {
if (hp->index[i].pmid == pmid) {
if (type & PM_TEXT_ONELINE)
return &hp->text[hp->index[i].off_oneline];
else
return &hp->text[hp->index[i].off_text];
}
}
return NULL;
}
/*
* retrieve pmInDom help text, ...
*
*/
char *
pmdaGetInDomHelp(int handle, pmInDom indom, int type)
{
int i;
help_t *hp;
pmID pmid;
__pmID_int *pip = (__pmID_int *)&pmid;
if (handle < 0 || handle >= numhelp)
return NULL;
hp = &tab[handle];
*pip = *((__pmID_int *)&indom);
/*
* set a bit here to disambiguate pmInDom from pmID
* -- this "hack" is shared between here and newhelp/newhelp.c
*/
pip->flag = 1;
/* search backwards ... pmInDom entries are at the end */
for (i = hp->numidx; i >= 1; i--) {
if (hp->index[i].pmid == pmid) {
if (type & PM_TEXT_ONELINE)
return &hp->text[hp->index[i].off_oneline];
else
return &hp->text[hp->index[i].off_text];
}
}
return NULL;
}
/*
* this is only here for chkhelp(1) ... export the control data strcuture
*/
void *
__pmdaHelpTab(void)
{
return (void *)tab;
}
void
pmdaCloseHelp(int handle)
{
help_t *hp;
if (handle < 0 || handle >= numhelp)
return;
hp = &tab[handle];
if (hp->dir_fd != -1)
close(hp->dir_fd);
if (hp->pag_fd != -1)
close(hp->pag_fd);
if (hp->index != NULL)
__pmMemoryUnmap((void *)hp->index, (hp->numidx+1) * sizeof(help_idx_t));
if (hp->text != NULL)
__pmMemoryUnmap(hp->text, hp->textlen);
hp->textlen = 0;
hp->dir_fd = -1;
hp->pag_fd = -1;
hp->numidx = 0;
hp->index = NULL;
hp->text = NULL;
}
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