/* $Id: runtests.c,v 1.5 2002/04/09 07:23:50 rra Exp $

   Run a set of tests, reporting results.

   Copyright 2000, 2001 Russ Allbery <rra@stanford.edu>

   Please note that this file is maintained separately from INN by the above
   author (which is why the coding style is slightly different).  Any fixes
   added to the INN tree should also be reported to the above author if
   necessary.

   Permission is hereby granted, free of charge, to any person obtaining a
   copy of this software and associated documentation files (the
   "Software"), to deal in the Software without restriction, including
   without limitation the rights to use, copy, modify, merge, publish,
   distribute, sublicense, and/or sell copies of the Software, and to
   permit persons to whom the Software is furnished to do so, subject to
   the following conditions:

   The above copyright notice and this permission notice shall be included
   in all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
   IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
   CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
   TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
   SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

   Usage:

        runtests <test-list>

   Expects a list of executables located in the given file, one line per
   executable.  For each one, runs it as part of a test suite, reporting
   results.  Test output should start with a line containing the number of
   tests (numbered from 1 to this number), and then each line should be in
   the following format:

        ok <number>
        not ok <number>
        ok <number> # skip

   where <number> is the number of the test.  ok indicates success, not ok
   indicates failure, and "# skip" indicates the test was skipped for some
   reason (maybe because it doesn't apply to this platform).

   This file is completely stand-alone by intention.  As stated more
   formally in the license above, you are welcome to include it in your
   packages as a test suite driver.  It requires ANSI C (__FILE__, __LINE__,
   void, const, stdarg.h, string.h) and POSIX (fcntl.h, unistd.h, pid_t) and
   won't compile out of the box on SunOS without adjustments to include
   strings.h instead.  This is intentionally not fixed using autoconf so
   that this file will not have a dependency on autoconf (although you're
   welcome to fix it for your project if you want).  Since it doesn't matter
   as much that the test suite for the software package be utterly portable
   to older systems, this file should be portable enough for most purposes.

   Any bug reports, bug fixes, and improvements are very much welcome and
   should be sent to the e-mail address above. */

#include "config.h"
#include "clibrary.h"
#include "portable/wait.h"
#include "portable/time.h"
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <sys/stat.h>

/* sys/time.h must be included before sys/resource.h on some platforms. */
#include <sys/resource.h>

/* Test status codes. */
enum test_status {
    TEST_FAIL,
    TEST_PASS,
    TEST_SKIP,
    TEST_INVALID
};

/* Error exit statuses for test processes. */
#define CHILDERR_DUP    100     /* Couldn't redirect stderr or stdout. */
#define CHILDERR_EXEC   101     /* Couldn't exec child process. */
#define CHILDERR_STDERR 102     /* Couldn't open stderr file. */

/* Structure to hold data for a set of tests. */
struct testset {
    const char *file;           /* The file name of the test. */
    int count;                  /* Expected count of tests. */
    int current;                /* The last seen test number. */
    int passed;                 /* Count of passing tests. */
    int failed;                 /* Count of failing lists. */
    int skipped;                /* Count of skipped tests (passed). */
    enum test_status *results;  /* Table of results by test number. */
    int aborted;                /* Whether the set as aborted. */
    int reported;               /* Whether the results were reported. */
    int status;                 /* The exit status of the test. */
};

/* Structure to hold a linked list of test sets. */
struct testlist {
    struct testset *ts;
    struct testlist *next;
};

/* Header used for test output.  %s is replaced by the file name of the list
   of tests. */
static const char banner[] = "\n\
Running all tests listed in %s.  If any tests fail, run the failing\n\
test program by hand to see more details.  The test program will have the\n\
same name as the test set but with \".t\" appended.\n\n";

/* Header for reports of failed tests. */
static const char header[] = "\n\
Failed Set                 Fail/Total (%) Skip Stat  Failing Tests\n\
-------------------------- -------------- ---- ----  ------------------------";

/* Include the file name and line number in malloc failures. */
#define xmalloc(size)   x_malloc((size), __FILE__, __LINE__)
#define xstrdup(p)      x_strdup((p), __FILE__, __LINE__)

/* Internal prototypes. */
static void sysdie(const char *format, ...);
static void *x_malloc(size_t, const char *file, int line);
static char *x_strdup(const char *, const char *file, int line);
static int test_analyze(const struct testset *);
static int test_batch(const char *testlist);
static void test_checkline(const char *line, struct testset *);
static void test_fail_summary(const struct testlist *);
static int test_init(const char *line, struct testset *);
static int test_print_range(int first, int last, int chars, int limit);
static void test_summarize(const struct testset *, int status);
static pid_t test_start(const char *path, int *fd);
static double tv_diff(const struct timeval *, const struct timeval *);
static double tv_seconds(const struct timeval *);
static double tv_sum(const struct timeval *, const struct timeval *);


/* Report a fatal error, including the results of strerror, and exit. */
static void
sysdie(const char *format, ...)
{
    int oerrno;
    va_list args;

    oerrno = errno;
    fflush(stdout);
    fprintf(stderr, "runtests: ");
    va_start(args, format);
    vfprintf(stderr, format, args);
    va_end(args);
    fprintf(stderr, ": %s\n", strerror(oerrno));
    exit(1);
}


/* Allocate memory, reporting a fatal error and exiting on failure. */
static void *
x_malloc(size_t size, const char *file, int line)
{
    void *p;

    p = malloc(size);
    if (!p)
        sysdie("failed to malloc %lu bytes at %s line %d",
               (unsigned long) size, file, line);
    return p;
}


/* Copy a string, reporting a fatal error and exiting on failure. */
static char *
x_strdup(const char *s, const char *file, int line)
{
    char *p;
    size_t len;

    len = strlen(s) + 1;
    p = malloc(len);
    if (!p)
        sysdie("failed to strdup %lu bytes at %s line %d",
               (unsigned long) len, file, line);
    memcpy(p, s, len);
    return p;
}


/* Given a struct timeval, return the number of seconds it represents as a
   double.  Use difftime() to convert a time_t to a double. */
static double
tv_seconds(const struct timeval *tv)
{
    return difftime(tv->tv_sec, 0) + tv->tv_usec * 1e-6;
}

/* Given two struct timevals, return the difference in seconds. */
static double
tv_diff(const struct timeval *tv1, const struct timeval *tv0)
{
    return tv_seconds(tv1) - tv_seconds(tv0);
}

/* Given two struct timevals, return the sum in seconds as a double. */
static double
tv_sum(const struct timeval *tv1, const struct timeval *tv2)
{
    return tv_seconds(tv1) + tv_seconds(tv2);
}


/* Read the first line of test output, which should contain the range of
   test numbers, and initialize the testset structure.  Assume it was zeroed
   before being passed in.  Return true if initialization succeeds, false
   otherwise. */
static int
test_init(const char *line, struct testset *ts)
{
    int i;

    /* Prefer a simple number of tests, but if the count is given as a range
       such as 1..10, accept that too for compatibility with Perl's
       Test::Harness. */
    while (isspace((unsigned char)(*line))) line++;
    if (!strncmp(line, "1..", 3)) line += 3;

    /* Get the count, check it for validity, and initialize the struct. */
    i = atoi(line);
    if (i <= 0) {
        puts("invalid test count");
        ts->aborted = 1;
        ts->reported = 1;
        return 0;
    }
    ts->count = i;
    ts->results = xmalloc(ts->count * sizeof(enum test_status));
    for (i = 0; i < ts->count; i++) ts->results[i] = TEST_INVALID;
    return 1;
}


/* Start a program, connecting its stdout to a pipe on our end and its
   stderr to /dev/null, and storing the file descriptor to read from in the
   two argument.  Returns the PID of the new process.  Errors are fatal. */
static pid_t
test_start(const char *path, int *fd)
{
    int fds[2], errfd;
    pid_t child;

    if (pipe(fds) == -1) sysdie("can't create pipe");
    child = fork();
    if (child == (pid_t) -1) {
        sysdie("can't fork");
    } else if (child == 0) {
        /* In child.  Set up our stdout and stderr. */
        errfd = open("/dev/null", O_WRONLY);
        if (errfd < 0) _exit(CHILDERR_STDERR);
        if (dup2(errfd, 2) == -1) _exit(CHILDERR_DUP);
        close(fds[0]);
        if (dup2(fds[1], 1) == -1) _exit(CHILDERR_DUP);

        /* Now, exec our process. */
        if (execl(path, path, (char *) 0) == -1) _exit(CHILDERR_EXEC);
    } else {
        /* In parent.  Close the extra file descriptor. */
        close(fds[1]);
    }
    *fd = fds[0];
    return child;
}


/* Given a single line of output from a test, parse it and return the
   success status of that test.  Anything printed to stdout not matching the
   form /^(not )?ok \d+/ is ignored.  Sets ts->current to the test number
   that just reported status. */
static void
test_checkline(const char *line, struct testset *ts)
{
    enum test_status status = TEST_PASS;
    int current;

    /* If the given line isn't newline-terminated, it was too big for an
       fgets(), which means ignore it. */
    if (line[strlen(line) - 1] != '\n') return;

    /* Parse the line, ignoring something we can't parse. */
    if (!strncmp(line, "not ", 4)) {
        status = TEST_FAIL;
        line += 4;
    }
    if (strncmp(line, "ok ", 3)) return;
    line += 3;
    current = atoi(line);
    if (current == 0) return;
    if (current < 0 || current > ts->count) {
        printf("invalid test number %d\n", current);
        ts->aborted = 1;
        ts->reported = 1;
        return;
    }
    while (isspace((unsigned char)(*line))) line++;
    while (isdigit((unsigned char)(*line))) line++;
    while (isspace((unsigned char)(*line))) line++;
    if (*line == '#') {
        line++;
        while (isspace((unsigned char)(*line))) line++;
        if (!strncmp(line, "skip", 4)) status = TEST_SKIP;
    }

    /* Make sure that the test number is in range and not a duplicate. */
    if (ts->results[current - 1] != TEST_INVALID) {
        printf("duplicate test number %d\n", current);
        ts->aborted = 1;
        ts->reported = 1;
        return;
    }

    /* Good results.  Increment our various counters. */
    switch (status) {
        case TEST_PASS: ts->passed++;   break;
        case TEST_FAIL: ts->failed++;   break;
        case TEST_SKIP: ts->skipped++;  break;
        default:                        break;
    }
    ts->current = current;
    ts->results[current - 1] = status;
}


/* Print out a range of test numbers, returning the number of characters it
   took up.  Add a comma and a space before the range if chars indicates
   that something has already been printed on the line, and print
   ... instead if chars plus the space needed would go over the limit (use a
   limit of 0 to disable this. */
static int
test_print_range(int first, int last, int chars, int limit)
{
    int needed = 0;
    int out = 0;
    int n;

    if (chars > 0) {
        needed += 2;
        if (!limit || chars <= limit) out += printf(", ");
    }
    for (n = first; n > 0; n /= 10)
        needed++;
    if (last > first) {
        for (n = last; n > 0; n /= 10)
            needed++;
        needed++;
    }
    if (limit && chars + needed > limit) {
        if (chars <= limit) out += printf("...");
    } else {
        if (last > first) out += printf("%d-", first);
        out += printf("%d", last);
    }
    return out;
}


/* Summarize a single test set.  The second argument is 0 if the set exited
   cleanly, a positive integer representing the exit status if it exited
   with a non-zero status, and a negative integer representing the signal
   that terminated it if it was killed by a signal. */
static void
test_summarize(const struct testset *ts, int status)
{
    int i;
    int missing = 0;
    int failed = 0;
    int first = 0;
    int last = 0;

    if (ts->aborted) {
        fputs("aborted", stdout);
        if (ts->count > 0)
            printf(", passed %d/%d", ts->passed, ts->count - ts->skipped);
    } else {
        for (i = 0; i < ts->count; i++) {
            if (ts->results[i] == TEST_INVALID) {
                if (missing == 0) fputs("MISSED ", stdout);
                if (first && i == last) {
                    last = i + 1;
                } else {
                    if (first) {
                        test_print_range(first, last, missing - 1, 0);
                    }
                    missing++;
                    first = i + 1;
                    last = i + 1;
                }
            }
        }
        if (first) test_print_range(first, last, missing - 1, 0);
        first = 0;
        last = 0;
        for (i = 0; i < ts->count; i++) {
            if (ts->results[i] == TEST_FAIL) {
                if (missing && !failed) fputs("; ", stdout);
                if (failed == 0) fputs("FAILED ", stdout);
                if (first && i == last) {
                    last = i + 1;
                } else {
                    if (first) {
                        test_print_range(first, last, failed - 1, 0);
                    }
                    failed++;
                    first = i + 1;
                    last = i + 1;
                }
            }
        }
        if (first) test_print_range(first, last, failed - 1, 0);
        if (!missing && !failed) {
            fputs(!status ? "ok" : "dubious", stdout);
            if (ts->skipped > 0) printf(" (skipped %d tests)", ts->skipped);
        }
    }
    if (status > 0) {
        printf(" (exit status %d)", status);
    } else if (status < 0) {
        printf(" (killed by signal %d%s)", -status,
               WCOREDUMP(ts->status) ? ", core dumped" : "");
    }
    putchar('\n');
}


/* Given a test set, analyze the results, classify the exit status, handle a
   few special error messages, and then pass it along to test_summarize()
   for the regular output. */
static int
test_analyze(const struct testset *ts)
{
    if (ts->reported) return 0;
    if (WIFEXITED(ts->status) && WEXITSTATUS(ts->status) != 0) {
        switch (WEXITSTATUS(ts->status)) {
        case CHILDERR_DUP:
            if (!ts->reported) puts("can't dup file descriptors");
            break;
        case CHILDERR_EXEC:
            if (!ts->reported) puts("execution failed (not found?)");
            break;
        case CHILDERR_STDERR:
            if (!ts->reported) puts("can't open /dev/null");
            break;
        default:
            test_summarize(ts, WEXITSTATUS(ts->status));
            break;
        }
        return 0;
    } else if (WIFSIGNALED(ts->status)) {
        test_summarize(ts, -WTERMSIG(ts->status));
        return 0;
    } else {
        test_summarize(ts, 0);
        return (ts->failed == 0);
    }
}


/* Runs a single test set, accumulating and then reporting the results.
   Returns true if the test set was successfully run and all tests passed,
   false otherwise. */
static int
test_run(struct testset *ts)
{
    pid_t testpid, child;
    int outfd, i, status;
    FILE *output;
    char buffer[BUFSIZ];
    char *file;

    /* Initialize the test and our data structures, flagging this set in
       error if the initialization fails. */
    file = xmalloc(strlen(ts->file) + 3);
    strcpy(file, ts->file);
    strcat(file, ".t");
    testpid = test_start(file, &outfd);
    free(file);
    output = fdopen(outfd, "r");
    if (!output) sysdie("fdopen failed");
    if (!fgets(buffer, sizeof(buffer), output)) ts->aborted = 1;
    if (!ts->aborted && !test_init(buffer, ts)) {
        while (fgets(buffer, sizeof(buffer), output))
            ;
        ts->aborted = 1;
    }

    /* Pass each line of output to test_checkline(). */
    while (!ts->aborted && fgets(buffer, sizeof(buffer), output))
        test_checkline(buffer, ts);
    if (ferror(output)) ts->aborted = 1;

    /* Close the output descriptor, retrieve the exit status, and pass that
       information to test_analyze() for eventual output. */
    fclose(output);
    child = waitpid(testpid, &ts->status, 0);
    if (child == (pid_t) -1)
        sysdie("waitpid for %u failed", (unsigned int) testpid);
    status = test_analyze(ts);

    /* Convert missing tests to failed tests. */
    for (i = 0; i < ts->count; i++) {
        if (ts->results[i] == TEST_INVALID) {
            ts->failed++;
            ts->results[i] = TEST_FAIL;
            status = 0;
        }
    }
    return status;
}


/* Summarize a list of test failures. */
static void
test_fail_summary(const struct testlist *fails)
{
    const struct testset *ts;
    int i, chars, total, first, last;

    puts(header);

    /* Failed Set                 Fail/Total (%) Skip Stat  Failing (25)
       -------------------------- -------------- ---- ----  -------------- */
    for (; fails; fails = fails->next) {
        ts = fails->ts;
        total = ts->count - ts->skipped;
        printf("%-26.26s %4d/%-4d %3.0f%% %4d ", ts->file, ts->failed,
               total, total ? (ts->failed * 100.0) / total : 0,
               ts->skipped);
        if (WIFEXITED(ts->status)) {
            printf("%4d  ", WEXITSTATUS(ts->status));
        } else {
            printf("  --  ");
        }
        if (ts->aborted) {
            puts("aborted");
            continue;
        }
        chars = 0;
        first = 0;
        last = 0;
        for (i = 0; i < ts->count; i++) {
            if (ts->results[i] == TEST_FAIL) {
                if (first && i == last) {
                    last = i + 1;
                } else {
                    if (first)
                        chars += test_print_range(first, last, chars, 20);
                    first = i + 1;
                    last = i + 1;
                }
            }
        }
        if (first) test_print_range(first, last, chars, 20);
        putchar('\n');
    }
}


/* Run a batch of tests from a given file listing each test on a line by
   itself.  The file must be rewindable.  Returns true iff all tests
   passed. */
static int
test_batch(const char *testlist)
{
    FILE *tests;
    size_t length, i;
    size_t longest = 0;
    char buffer[BUFSIZ];
    int line;
    struct testset ts, *tmp;
    struct timeval start, end;
    struct rusage stats;
    struct testlist *failhead = 0;
    struct testlist *failtail = 0;
    int total = 0;
    int passed = 0;
    int skipped = 0;
    int failed = 0;
    int aborted = 0;

    /* Open our file of tests to run and scan it, checking for lines that
       are too long and searching for the longest line. */
    tests = fopen(testlist, "r");
    if (!tests) sysdie("can't open %s", testlist);
    line = 0;
    while (fgets(buffer, sizeof(buffer), tests)) {
        line++;
        length = strlen(buffer) - 1;
        if (buffer[length] != '\n') {
            fprintf(stderr, "%s:%d: line too long\n", testlist, line);
            exit(1);
        }
        if (length > longest) longest = length;
    }
    if (fseek(tests, 0, SEEK_SET) == -1)
        sysdie("can't rewind %s", testlist);

    /* Add two to longest and round up to the nearest tab stop.  This is how
       wide the column for printing the current test name will be. */
    longest += 2;
    if (longest % 8) longest += 8 - (longest % 8);

    /* Start the wall clock timer. */
    gettimeofday(&start, NULL);

    /* Now, plow through our tests again, running each one.  Check line
       length again out of paranoia. */
    line = 0;
    while (fgets(buffer, sizeof(buffer), tests)) {
        line++;
        length = strlen(buffer) - 1;
        if (buffer[length] != '\n') {
            fprintf(stderr, "%s:%d: line too long\n", testlist, line);
            exit(1);
        }
        buffer[length] = '\0';
        fputs(buffer, stdout);
        for (i = length; i < longest; i++) putchar('.');
        memset(&ts, 0, sizeof(ts));
        ts.file = xstrdup(buffer);
        if (!test_run(&ts)) {
            tmp = xmalloc(sizeof(struct testset));
            memcpy(tmp, &ts, sizeof(struct testset));
            if (!failhead) {
                failhead = xmalloc(sizeof(struct testset));
                failhead->ts = tmp;
                failhead->next = 0;
                failtail = failhead;
            } else {
                failtail->next = xmalloc(sizeof(struct testset));
                failtail = failtail->next;
                failtail->ts = tmp;
                failtail->next = 0;
            }
        }
        aborted += ts.aborted;
        total += ts.count;
        passed += ts.passed;
        skipped += ts.skipped;
        failed += ts.failed;
    }
    total -= skipped;

    /* Stop the timer and get our child resource statistics. */
    gettimeofday(&end, NULL);
    getrusage(RUSAGE_CHILDREN, &stats);

    /* Print out our final results. */
    if (failhead) test_fail_summary(failhead);
    putchar('\n');
    if (aborted) {
        printf("Aborted %d test sets, passed %d/%d tests.\n", aborted,
               passed, total);
    } else if (failed == 0) {
        fputs("All tests successful", stdout);
        if (skipped) printf(", %d tests skipped", skipped);
        puts(".");
    } else {
        printf("Failed %d/%d tests, %.2f%% okay.\n", failed, total,
               (total - failed) * 100.0 / total);
    }
    printf("Files=%d,  Tests=%d", line, total);
    printf(",  %.2f seconds", tv_diff(&end, &start));
    printf(" (%.2f usr + %.2f sys = %.2f CPU)\n",
           tv_seconds(&stats.ru_utime), tv_seconds(&stats.ru_stime),
           tv_sum(&stats.ru_utime, &stats.ru_stime));
    return !(failed || aborted);
}


/* Main routine.  Given a file listing tests, run each test listed. */
int
main(int argc, char *argv[])
{
    if (argc != 2) {
        fprintf(stderr, "Usage: runtests <test-list>\n");
        exit(1);
    }
    printf(banner, argv[1]);
    exit(test_batch(argv[1]) ? 0 : 1);
}
