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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "primpl.h"
#include "prsystem.h"
#include "prprf.h"
#include "prlong.h"

#if defined(OS2)
#define INCL_DOS
#define INCL_DOSMISC
#include <os2.h>
/* define the required constant if it is not already defined in the headers */
#ifndef QSV_NUMPROCESSORS
#define QSV_NUMPROCESSORS 26
#endif
#endif

/* BSD-derived systems use sysctl() to get the number of processors */
#if defined(BSDI) || defined(FREEBSD) || defined(NETBSD) \
    || defined(OPENBSD) || defined(DRAGONFLY) || defined(DARWIN)
#define _PR_HAVE_SYSCTL
#include <sys/param.h>
#include <sys/sysctl.h>
#endif

#if defined(DARWIN)
#include <mach/mach_init.h>
#include <mach/mach_host.h>
#include <mach/mach_port.h>
#endif

#if defined(HPUX)
#include <sys/mpctl.h>
#include <sys/pstat.h>
#endif

#if defined(XP_UNIX)
#include <unistd.h>
#include <sys/utsname.h>
#endif

#if defined(LINUX)
#include <string.h>
#include <ctype.h>
#define MAX_LINE 512
#endif

#if defined(AIX)
#include <cf.h>
#include <sys/cfgodm.h>
#endif

PR_IMPLEMENT(char) PR_GetDirectorySeparator(void)
{
    return PR_DIRECTORY_SEPARATOR;
}  /* PR_GetDirectorySeparator */

/*
** OBSOLETE -- the function name is misspelled.
*/
PR_IMPLEMENT(char) PR_GetDirectorySepartor(void)
{
#if defined(DEBUG)
    static PRBool warn = PR_TRUE;
    if (warn) {
        warn = _PR_Obsolete("PR_GetDirectorySepartor()",
                            "PR_GetDirectorySeparator()");
    }
#endif
    return PR_GetDirectorySeparator();
}  /* PR_GetDirectorySepartor */

PR_IMPLEMENT(char) PR_GetPathSeparator(void)
{
    return PR_PATH_SEPARATOR;
}  /* PR_GetPathSeparator */

PR_IMPLEMENT(PRStatus) PR_GetSystemInfo(PRSysInfo cmd, char *buf, PRUint32 buflen)
{
    PRUintn len = 0;

    if (!_pr_initialized) {
        _PR_ImplicitInitialization();
    }

    switch(cmd)
    {
        case PR_SI_HOSTNAME:
        case PR_SI_HOSTNAME_UNTRUNCATED:
            if (PR_FAILURE == _PR_MD_GETHOSTNAME(buf, (PRUintn)buflen)) {
                return PR_FAILURE;
            }

            if (cmd == PR_SI_HOSTNAME_UNTRUNCATED) {
                break;
            }
            /*
             * On some platforms a system does not have a hostname and
             * its IP address is returned instead.   The following code
             * should be skipped on those platforms.
             */
#ifndef _PR_GET_HOST_ADDR_AS_NAME
            /* Return the unqualified hostname */
            while (buf[len] && (len < buflen)) {
                if (buf[len] == '.') {
                    buf[len] = '\0';
                    break;
                }
                len += 1;
            }
#endif
            break;

        case PR_SI_SYSNAME:
            /* Return the operating system name */
#if defined(XP_UNIX) || defined(WIN32)
            if (PR_FAILURE == _PR_MD_GETSYSINFO(cmd, buf, (PRUintn)buflen)) {
                return PR_FAILURE;
            }
#else
            (void)PR_snprintf(buf, buflen, _PR_SI_SYSNAME);
#endif
            break;

        case PR_SI_RELEASE:
            /* Return the version of the operating system */
#if defined(XP_UNIX) || defined(WIN32)
            if (PR_FAILURE == _PR_MD_GETSYSINFO(cmd, buf, (PRUintn)buflen)) {
                return PR_FAILURE;
            }
#endif
#if defined(XP_OS2)
            {
                ULONG os2ver[2] = {0};
                DosQuerySysInfo(QSV_VERSION_MINOR, QSV_VERSION_REVISION,
                                &os2ver, sizeof(os2ver));
                /* Formatting for normal usage (2.11, 3.0, 4.0, 4.5); officially,
                   Warp 4 is version 2.40.00, WSeB 2.45.00 */
                if (os2ver[0] < 30)
                    (void)PR_snprintf(buf, buflen, "%s%lu",
                                      "2.", os2ver[0]);
                else if (os2ver[0] < 45)
                    (void)PR_snprintf(buf, buflen, "%lu%s%lu",
                                      os2ver[0]/10, ".", os2ver[1]);
                else
                    (void)PR_snprintf(buf, buflen, "%.1f",
                                      os2ver[0]/10.0);
            }
#endif /* OS2 */
            break;

        case PR_SI_ARCHITECTURE:
            /* Return the architecture of the machine (ie. x86, mips, alpha, ...)*/
            (void)PR_snprintf(buf, buflen, _PR_SI_ARCHITECTURE);
            break;
        default:
            PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
            return PR_FAILURE;
    }
    return PR_SUCCESS;
}

/*
** PR_GetNumberOfProcessors()
**
** Implementation notes:
**   Every platform does it a bit different.
**     numCpus is the returned value.
**   for each platform's "if defined" section
**     declare your local variable
**     do your thing, assign to numCpus
**   order of the if defined()s may be important,
**     especially for unix variants. Do platform
**     specific implementations before XP_UNIX.
**
*/
PR_IMPLEMENT(PRInt32) PR_GetNumberOfProcessors( void )
{
    PRInt32     numCpus;
#if defined(WIN32)
    SYSTEM_INFO     info;

    GetSystemInfo( &info );
    numCpus = info.dwNumberOfProcessors;
#elif defined(OS2)
    DosQuerySysInfo( QSV_NUMPROCESSORS, QSV_NUMPROCESSORS, &numCpus, sizeof(numCpus));
#elif defined(_PR_HAVE_SYSCTL)
    int mib[2];
    int rc;
    size_t len = sizeof(numCpus);

    mib[0] = CTL_HW;
    mib[1] = HW_NCPU;
    rc = sysctl( mib, 2, &numCpus, &len, NULL, 0 );
    if ( -1 == rc )  {
        numCpus = -1; /* set to -1 for return value on error */
        _PR_MD_MAP_DEFAULT_ERROR( _MD_ERRNO() );
    }
#elif defined(HPUX)
    numCpus = mpctl( MPC_GETNUMSPUS, 0, 0 );
    if ( numCpus < 1 )  {
        numCpus = -1; /* set to -1 for return value on error */
        _PR_MD_MAP_DEFAULT_ERROR( _MD_ERRNO() );
    }
#elif defined(RISCOS)
    numCpus = 1;
#elif defined(LINUX)
    /* for the benefit of devices with advanced power-saving, that
       actually hotplug their cpus in heavy load, try to figure out
       the real number of CPUs */
    char buf[MAX_LINE];
    FILE *fin;
    const char *cpu_present = "/sys/devices/system/cpu/present";
    size_t strsize;
    numCpus = 0;
    fin = fopen(cpu_present, "r");
    if (fin != NULL) {
        if (fgets(buf, MAX_LINE, fin) != NULL) {
            /* check that the format is what we expect */
            if (buf[0] == '0') {
                strsize = strlen(buf);
                if (strsize == 1) {
                    /* single core */
                    numCpus = 1;
                } else if (strsize >= 3 && strsize <= 5) {
                    /* should be of the form 0-999 */
                    /* parse the part after the 0-, note count is 0-based */
                    if (buf[1] == '-' && isdigit(buf[2])) {
                        numCpus = 1 + atoi(buf + 2);
                    }
                }
            }
        }
        fclose(fin);
    }
    /* if that fails, fall back to more standard methods */
    if (!numCpus) {
        numCpus = sysconf( _SC_NPROCESSORS_CONF );
    }
#elif defined(XP_UNIX)
    numCpus = sysconf( _SC_NPROCESSORS_CONF );
#else
#error "An implementation is required"
#endif
    return(numCpus);
} /* end PR_GetNumberOfProcessors() */

/*
** PR_GetPhysicalMemorySize()
**
** Implementation notes:
**   Every platform does it a bit different.
**     bytes is the returned value.
**   for each platform's "if defined" section
**     declare your local variable
**     do your thing, assign to bytes.
**
*/
PR_IMPLEMENT(PRUint64) PR_GetPhysicalMemorySize(void)
{
    PRUint64 bytes = 0;

#if defined(LINUX) || defined(SOLARIS)

    long pageSize = sysconf(_SC_PAGESIZE);
    long pageCount = sysconf(_SC_PHYS_PAGES);
    if (pageSize >= 0 && pageCount >= 0) {
        bytes = (PRUint64) pageSize * pageCount;
    }

#elif defined(NETBSD) || defined(OPENBSD) \
    || defined(FREEBSD) || defined(DRAGONFLY)

    int mib[2];
    int rc;
#ifdef HW_PHYSMEM64
    uint64_t memSize;
#else
    unsigned long memSize;
#endif
    size_t len = sizeof(memSize);

    mib[0] = CTL_HW;
#ifdef HW_PHYSMEM64
    mib[1] = HW_PHYSMEM64;
#else
    mib[1] = HW_PHYSMEM;
#endif
    rc = sysctl(mib, 2, &memSize, &len, NULL, 0);
    if (-1 != rc)  {
        bytes = memSize;
    }

#elif defined(HPUX)

    struct pst_static info;
    int result = pstat_getstatic(&info, sizeof(info), 1, 0);
    if (result == 1) {
        bytes = (PRUint64) info.physical_memory * info.page_size;
    }

#elif defined(DARWIN)

    mach_port_t mach_host = mach_host_self();
    struct host_basic_info hInfo;
    mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;

    int result = host_info(mach_host,
                           HOST_BASIC_INFO,
                           (host_info_t) &hInfo,
                           &count);
    mach_port_deallocate(mach_task_self(), mach_host);
    if (result == KERN_SUCCESS) {
        bytes = hInfo.max_mem;
    }

#elif defined(WIN32)

    MEMORYSTATUSEX memStat;
    memStat.dwLength = sizeof(memStat);
    if (GlobalMemoryStatusEx(&memStat)) {
        bytes = memStat.ullTotalPhys;
    }

#elif defined(OS2)

    ULONG ulPhysMem;
    DosQuerySysInfo(QSV_TOTPHYSMEM,
                    QSV_TOTPHYSMEM,
                    &ulPhysMem,
                    sizeof(ulPhysMem));
    bytes = ulPhysMem;

#elif defined(AIX)

    if (odm_initialize() == 0) {
        int how_many;
        struct CuAt *obj = getattr("sys0", "realmem", 0, &how_many);
        if (obj != NULL) {
            bytes = (PRUint64) atoi(obj->value) * 1024;
            free(obj);
        }
        odm_terminate();
    }

#else

    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);

#endif

    return bytes;
} /* end PR_GetPhysicalMemorySize() */