/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1992, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>

#include <err.h>
#include <limits.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <vis.h>

#include "ps.h"

static char *cmdpart(char *);
static char *shquote(char **);

static char *
shquote(char **argv)
{
        long arg_max;
        static size_t buf_size;
        size_t len;
        char **p, *dst, *src;
        static char *buf = NULL;

        if (buf == NULL) {
                if ((arg_max = sysconf(_SC_ARG_MAX)) == -1)
                        errx(1, "sysconf _SC_ARG_MAX failed");
                if (arg_max >= LONG_MAX / 4 || arg_max >= (long)(SIZE_MAX / 4))
                        errx(1, "sysconf _SC_ARG_MAX preposterously large");
                buf_size = 4 * arg_max + 1;
                if ((buf = malloc(buf_size)) == NULL)
                        errx(1, "malloc failed");
        }

        if (*argv == NULL) {
                buf[0] = '\0';
                return (buf);
        }
        dst = buf;
        for (p = argv; (src = *p++) != NULL; ) {
                if (*src == '\0')
                        continue;
                len = (buf_size - 1 - (dst - buf)) / 4;
                strvisx(dst, src, strlen(src) < len ? strlen(src) : len,
                    VIS_NL | VIS_CSTYLE);
                while (*dst != '\0')
                        dst++;
                if ((buf_size - 1 - (dst - buf)) / 4 > 0)
                        *dst++ = ' ';
        }
        /* Chop off trailing space */
        if (dst != buf && dst[-1] == ' ')
                dst--;
        *dst = '\0';
        return (buf);
}

static char *
cmdpart(char *arg0)
{
        char *cp;

        return ((cp = strrchr(arg0, '/')) != NULL ? cp + 1 : arg0);
}

const char *
fmt_argv(char **argv, char *cmd, char *thread, size_t maxlen)
{
        size_t len;
        char *ap, *cp;

        if (argv == NULL || argv[0] == NULL) {
                if (cmd == NULL)
                        return ("");
                ap = NULL;
                len = maxlen + 3;
        } else {
                ap = shquote(argv);
                len = strlen(ap) + maxlen + 4;
        }
        cp = malloc(len);
        if (cp == NULL)
                errx(1, "malloc failed");
        if (ap == NULL) {
                if (thread != NULL) {
                        asprintf(&ap, "%s/%s", cmd, thread);
                        sprintf(cp, "[%.*s]", (int)maxlen, ap);
                        free(ap);
                } else
                        sprintf(cp, "[%.*s]", (int)maxlen, cmd);
        } else if (strncmp(cmdpart(argv[0]), cmd, maxlen) != 0)
                sprintf(cp, "%s (%.*s)", ap, (int)maxlen, cmd);
        else
                strcpy(cp, ap);
        return (cp);
}