/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma weak _confstr = confstr

#include "lint.h"
#include "xpg6.h"
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>

typedef struct {
        int     config_value;
        char    *value;
} config;

/*
 * keep these in the same order as in sys/unistd.h
 */
static const config     default_conf[] = {
        { _CS_LFS_CFLAGS,       "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64" },
        { _CS_LFS_LDFLAGS,      ""                                      },
        { _CS_LFS_LIBS,         ""                                      },
        { _CS_LFS_LINTFLAGS,    "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64" },
        { _CS_LFS64_CFLAGS,     "-D_LARGEFILE64_SOURCE"                 },
        { _CS_LFS64_LDFLAGS,    ""                                      },
        { _CS_LFS64_LIBS,       ""                                      },
        { _CS_LFS64_LINTFLAGS,  "-D_LARGEFILE64_SOURCE"                 },
        { _CS_XBS5_ILP32_OFF32_CFLAGS,  ""                              },
        { _CS_XBS5_ILP32_OFF32_LDFLAGS, ""                              },
        { _CS_XBS5_ILP32_OFF32_LIBS,    ""                              },
        { _CS_XBS5_ILP32_OFF32_LINTFLAGS, ""                            },
        { _CS_XBS5_ILP32_OFFBIG_CFLAGS,
"-Xa -Usun -Usparc -Uunix -Ui386 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64" },
        { _CS_XBS5_ILP32_OFFBIG_LDFLAGS, ""                             },
        { _CS_XBS5_ILP32_OFFBIG_LIBS,   ""                              },
        { _CS_XBS5_ILP32_OFFBIG_LINTFLAGS,
                "-Xa -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"},
        { _CS_POSIX_V6_ILP32_OFF32_CFLAGS,      ""                      },
        { _CS_POSIX_V6_ILP32_OFF32_LDFLAGS,     ""                      },
        { _CS_POSIX_V6_ILP32_OFF32_LIBS,        ""                      },
        { _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS,
"-Xa -Usun -Usparc -Uunix -Ui386 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64" },
        { _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS,    ""                      },
        { _CS_POSIX_V6_ILP32_OFFBIG_LIBS,       ""                      },
        { _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS,
                "POSIX_V6_ILP32_OFF32\nPOSIX_V6_ILP32_OFFBIG\n"
                "POSIX_V6_LP64_OFF64\nPOSIX_V6_LPBIG_OFFBIG"            },
        { _CS_XBS5_LP64_OFF64_CFLAGS, "-xarch=generic64"                },
        { _CS_XBS5_LP64_OFF64_LDFLAGS,  "-xarch=generic64"              },
        { _CS_XBS5_LP64_OFF64_LIBS,     ""                              },
        { _CS_XBS5_LP64_OFF64_LINTFLAGS, "-xarch=generic64"             },
        { _CS_XBS5_LPBIG_OFFBIG_CFLAGS, "-xarch=generic64"              },
        { _CS_XBS5_LPBIG_OFFBIG_LDFLAGS, "-xarch=generic64"             },
        { _CS_XBS5_LPBIG_OFFBIG_LIBS,   ""                              },
        { _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS, "-xarch=generic64"           },
        { _CS_POSIX_V6_LP64_OFF64_CFLAGS, "-xarch=generic64"            },
        { _CS_POSIX_V6_LP64_OFF64_LDFLAGS, "-xarch=generic64"           },
        { _CS_POSIX_V6_LP64_OFF64_LIBS, ""                              },
        { _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS, "-xarch=generic64"          },
        { _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS, "-xarch=generic64"         },
        { _CS_POSIX_V6_LPBIG_OFFBIG_LIBS, ""                            },
};

#define CS_ENTRY_COUNT (sizeof (default_conf) / sizeof (config))

size_t
confstr(int name, char *buf, size_t length)
{
        size_t                  conf_length;
        config                  *entry;
        int                     i;
        char                    *path;

        /* Keep _CS_PATH in sync with execvp.c */

        if (name == _CS_PATH) {
                if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)
                        path = "/usr/xpg6/bin:/usr/xpg4/bin:/usr/ccs/bin:"
                            "/usr/bin:/opt/SUNWspro/bin";
                else
                        path = "/usr/xpg4/bin:/usr/ccs/bin:/usr/bin:"
                            "/opt/SUNWspro/bin";

                conf_length = strlen(path) + 1;
                if (length != 0) {
                        (void) strncpy(buf, path, length);
                        buf[length - 1] = '\0';
                }
                return (conf_length);
        }
        /*
         * Make sure others are known configuration parameters
         */
        entry = (config *)default_conf;
        for (i = 0; i < CS_ENTRY_COUNT; i++) {
                if (name == entry->config_value) {
                        /*
                         * Copy out the parameter from our tables.
                         */
                        conf_length = strlen(entry->value) + 1;
                        if (length != 0) {
                                (void) strncpy(buf, entry->value, length);
                                buf[length - 1] = '\0';
                        }
                        return (conf_length);
                }
                entry++;
        }

        /* If the entry was not found in table return an error */
        errno = EINVAL;
        return ((size_t)0);
}