/src/file/src/funcs.c

Source (jump to first uncovered line)
/*
 * Copyright (c) Christos Zoulas 2003.
 * 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 immediately at the beginning of the file, without modification,
 *    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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 "file.h"

#ifndef lint
FILE_RCSID("@(#)$File: funcs.c,v 1.142 2023/07/30 14:41:14 christos Exp $")
#endif  /* lint */

#include "magic.h"
#include <assert.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* for pipe2() */
#endif
#if defined(HAVE_WCHAR_H)
#include <wchar.h>
#endif
#if defined(HAVE_WCTYPE_H)
#include <wctype.h>
#endif
#include <limits.h>

#ifndef SIZE_MAX
#define SIZE_MAX  ((size_t)~0)
#endif

file_protected char *
file_copystr(char *buf, size_t blen, size_t width, const char *str)
{
  if (blen == 0)
    return buf;
  if (width >= blen)
    width = blen - 1;
  memcpy(buf, str, width);
  buf[width] = '\0';
  return buf;
}

file_private void
file_clearbuf(struct magic_set *ms)
{
  free(ms->o.buf);
  ms->o.buf = NULL;
  ms->o.blen = 0;
}

file_private int
file_checkfield(char *msg, size_t mlen, const char *what, const char **pp)
{
  const char *p = *pp;
  int fw = 0;

  while (*p && isdigit((unsigned char)*p))
    fw = fw * 10 + (*p++ - '0');

  *pp = p;

  if (fw < 1024)
    return 1;
  if (msg)
    snprintf(msg, mlen, "field %s too large: %d", what, fw);

  return 0;
}

file_protected int
file_checkfmt(char *msg, size_t mlen, const char *fmt)
{
  const char *p;
  for (p = fmt; *p; p++) {
    if (*p != '%')
      continue;
    if (*++p == '%')
      continue;
    // Skip uninteresting.
    while (strchr("#0.'+- ", *p) != NULL)
      p++;
    if (*p == '*') {
      if (msg)
        snprintf(msg, mlen, "* not allowed in format");
      return -1;
    }

    if (!file_checkfield(msg, mlen, "width", &p))
      return -1;

    if (*p == '.') {
      p++;
      if (!file_checkfield(msg, mlen, "precision", &p))
        return -1;
    }

    if (!isalpha((unsigned char)*p)) {
      if (msg)
        snprintf(msg, mlen, "bad format char: %c", *p);
      return -1;
    }
  }
  return 0;
}

/*
 * Like printf, only we append to a buffer.
 */
file_protected int
file_vprintf(struct magic_set *ms, const char *fmt, va_list ap)
{
  int len;
  char *buf, *newstr;
  char tbuf[1024];

  if (ms->event_flags & EVENT_HAD_ERR)
    return 0;

  if (file_checkfmt(tbuf, sizeof(tbuf), fmt)) {
    file_clearbuf(ms);
    file_error(ms, 0, "Bad magic format `%s' (%s)", fmt, tbuf);
    return -1;
  }

  len = vasprintf(&buf, fmt, ap);
  if (len < 0 || (size_t)len > 1024 || len + ms->o.blen > 1024 * 1024) {
    size_t blen = ms->o.blen;
    free(buf);
    file_clearbuf(ms);
    file_error(ms, 0, "Output buffer space exceeded %d+%"
        SIZE_T_FORMAT "u", len, blen);
    return -1;
  }

  if (ms->o.buf != NULL) {
    len = asprintf(&newstr, "%s%s", ms->o.buf, buf);
    free(buf);
    if (len < 0)
      goto out;
    free(ms->o.buf);
    buf = newstr;
  }
  ms->o.buf = buf;
  ms->o.blen = len;
  return 0;
out:
  file_clearbuf(ms);
  file_error(ms, errno, "vasprintf failed");
  return -1;
}

file_protected int
file_printf(struct magic_set *ms, const char *fmt, ...)
{
  int rv;
  va_list ap;

  va_start(ap, fmt);
  rv = file_vprintf(ms, fmt, ap);
  va_end(ap);
  return rv;
}

/*
 * error - print best error message possible
 */
/*VARARGS*/
__attribute__((__format__(__printf__, 3, 0)))
file_private void
file_error_core(struct magic_set *ms, int error, const char *f, va_list va,
    size_t lineno)
{
  /* Only the first error is ok */
  if (ms->event_flags & EVENT_HAD_ERR)
    return;
  if (lineno != 0) {
    file_clearbuf(ms);
    (void)file_printf(ms, "line %" SIZE_T_FORMAT "u:", lineno);
  }
  if (ms->o.buf && *ms->o.buf)
    (void)file_printf(ms, " ");
  (void)file_vprintf(ms, f, va);
  if (error > 0)
    (void)file_printf(ms, " (%s)", strerror(error));
  ms->event_flags |= EVENT_HAD_ERR;
  ms->error = error;
}

/*VARARGS*/
file_protected void
file_error(struct magic_set *ms, int error, const char *f, ...)
{
  va_list va;
  va_start(va, f);
  file_error_core(ms, error, f, va, 0);
  va_end(va);
}

/*
 * Print an error with magic line number.
 */
/*VARARGS*/
file_protected void
file_magerror(struct magic_set *ms, const char *f, ...)
{
  va_list va;
  va_start(va, f);
  file_error_core(ms, 0, f, va, ms->line);
  va_end(va);
}

file_protected void
file_oomem(struct magic_set *ms, size_t len)
{
  file_error(ms, errno, "cannot allocate %" SIZE_T_FORMAT "u bytes",
      len);
}

file_protected void
file_badseek(struct magic_set *ms)
{
  file_error(ms, errno, "error seeking");
}

file_protected void
file_badread(struct magic_set *ms)
{
  file_error(ms, errno, "error reading");
}

#ifndef COMPILE_ONLY
#define FILE_SEPARATOR "\n- "

file_protected int
file_separator(struct magic_set *ms)
{
  return file_printf(ms, FILE_SEPARATOR);
}

static void
trim_separator(struct magic_set *ms)
{
  size_t l;

  if (ms->o.buf == NULL)
    return;

  l = strlen(ms->o.buf);
  if (l < sizeof(FILE_SEPARATOR))
    return;

  l -= sizeof(FILE_SEPARATOR) - 1;
  if (strcmp(ms->o.buf + l, FILE_SEPARATOR) != 0)
    return;

  ms->o.buf[l] = '\0';
}

static int
checkdone(struct magic_set *ms, int *rv)
{
  if ((ms->flags & MAGIC_CONTINUE) == 0)
    return 1;
  if (file_separator(ms) == -1)
    *rv = -1;
  return 0;
}

file_protected int
file_default(struct magic_set *ms, size_t nb)
{
  if (ms->flags & MAGIC_MIME) {
    if ((ms->flags & MAGIC_MIME_TYPE) &&
        file_printf(ms, "application/%s",
      nb ? "octet-stream" : "x-empty") == -1)
      return -1;
    return 1;
  }
  if (ms->flags & MAGIC_APPLE) {
    if (file_printf(ms, "UNKNUNKN") == -1)
      return -1;
    return 1;
  }
  if (ms->flags & MAGIC_EXTENSION) {
    if (file_printf(ms, "???") == -1)
      return -1;
    return 1;
  }
  return 0;
}

/*
 * The magic detection functions return:
 *   1: found
 *   0: not found
 *  -1: error
 */
/*ARGSUSED*/
file_protected int
file_buffer(struct magic_set *ms, int fd, struct stat *st,
    const char *inname __attribute__ ((__unused__)),
    const void *buf, size_t nb)
{
  int m = 0, rv = 0, looks_text = 0;
  const char *code = NULL;
  const char *code_mime = "binary";
  const char *def = "data";
  const char *ftype = NULL;
  char *rbuf = NULL;
  struct buffer b;

  buffer_init(&b, fd, st, buf, nb);
  ms->mode = b.st.st_mode;

  if (nb == 0) {
    def = "empty";
    goto simple;
  } else if (nb == 1) {
    def = "very short file (no magic)";
    goto simple;
  }

  if ((ms->flags & MAGIC_NO_CHECK_ENCODING) == 0) {
    looks_text = file_encoding(ms, &b, NULL, 0,
        &code, &code_mime, &ftype);
  }

#ifdef __EMX__
  if ((ms->flags & MAGIC_NO_CHECK_APPTYPE) == 0 && inname) {
    m = file_os2_apptype(ms, inname, &b);
    if ((ms->flags & MAGIC_DEBUG) != 0)
      (void)fprintf(stderr, "[try os2_apptype %d]\n", m);
    switch (m) {
    case -1:
      return -1;
    case 0:
      break;
    default:
      return 1;
    }
  }
#endif
#if HAVE_FORK
  /* try compression stuff */
  if ((ms->flags & MAGIC_NO_CHECK_COMPRESS) == 0) {
    m = file_zmagic(ms, &b, inname);
    if ((ms->flags & MAGIC_DEBUG) != 0)
      (void)fprintf(stderr, "[try zmagic %d]\n", m);
    if (m) {
      goto done_encoding;
    }
  }
#endif
  /* Check if we have a tar file */
  if ((ms->flags & MAGIC_NO_CHECK_TAR) == 0) {
    m = file_is_tar(ms, &b);
    if ((ms->flags & MAGIC_DEBUG) != 0)
      (void)fprintf(stderr, "[try tar %d]\n", m);
    if (m) {
      if (checkdone(ms, &rv))
        goto done;
    }
  }

  /* Check if we have a JSON file */
  if ((ms->flags & MAGIC_NO_CHECK_JSON) == 0) {
    m = file_is_json(ms, &b);
    if ((ms->flags & MAGIC_DEBUG) != 0)
      (void)fprintf(stderr, "[try json %d]\n", m);
    if (m) {
      if (checkdone(ms, &rv))
        goto done;
    }
  }

  /* Check if we have a CSV file */
  if ((ms->flags & MAGIC_NO_CHECK_CSV) == 0) {
    m = file_is_csv(ms, &b, looks_text, code);
    if ((ms->flags & MAGIC_DEBUG) != 0)
      (void)fprintf(stderr, "[try csv %d]\n", m);
    if (m) {
      if (checkdone(ms, &rv))
        goto done;
    }
  }

  /* Check if we have a SIMH tape file */
  if ((ms->flags & MAGIC_NO_CHECK_SIMH) == 0) {
    m = file_is_simh(ms, &b);
    if ((ms->flags & MAGIC_DEBUG) != 0)
      (void)fprintf(stderr, "[try simh %d]\n", m);
    if (m) {
      if (checkdone(ms, &rv))
        goto done;
    }
  }

  /* Check if we have a CDF file */
  if ((ms->flags & MAGIC_NO_CHECK_CDF) == 0) {
    m = file_trycdf(ms, &b);
    if ((ms->flags & MAGIC_DEBUG) != 0)
      (void)fprintf(stderr, "[try cdf %d]\n", m);
    if (m) {
      if (checkdone(ms, &rv))
        goto done;
    }
  }
#ifdef BUILTIN_ELF
  if ((ms->flags & MAGIC_NO_CHECK_ELF) == 0 && nb > 5 && fd != -1) {
    file_pushbuf_t *pb;
    /*
     * We matched something in the file, so this
     * *might* be an ELF file, and the file is at
     * least 5 bytes long, so if it's an ELF file
     * it has at least one byte past the ELF magic
     * number - try extracting information from the
     * ELF headers that cannot easily be  extracted
     * with rules in the magic file. We we don't
     * print the information yet.
     */
    if ((pb = file_push_buffer(ms)) == NULL)
      return -1;

    rv = file_tryelf(ms, &b);
    rbuf = file_pop_buffer(ms, pb);
    if (rv == -1) {
      free(rbuf);
      rbuf = NULL;
    }
    if ((ms->flags & MAGIC_DEBUG) != 0)
      (void)fprintf(stderr, "[try elf %d]\n", m);
  }
#endif

  /* try soft magic tests */
  if ((ms->flags & MAGIC_NO_CHECK_SOFT) == 0) {
    m = file_softmagic(ms, &b, NULL, NULL, BINTEST, looks_text);
    if ((ms->flags & MAGIC_DEBUG) != 0)
      (void)fprintf(stderr, "[try softmagic %d]\n", m);
    if (m == 1 && rbuf) {
      if (file_printf(ms, "%s", rbuf) == -1)
        goto done;
    }
    if (m) {
      if (checkdone(ms, &rv))
        goto done;
    }
  }

  /* try text properties */
  if ((ms->flags & MAGIC_NO_CHECK_TEXT) == 0) {

    m = file_ascmagic(ms, &b, looks_text);
    if ((ms->flags & MAGIC_DEBUG) != 0)
      (void)fprintf(stderr, "[try ascmagic %d]\n", m);
    if (m) {
      goto done;
    }
  }

simple:
  /* give up */
  if (m == 0) {
    m = 1;
    rv = file_default(ms, nb);
    if (rv == 0)
      if (file_printf(ms, "%s", def) == -1)
        rv = -1;
  }
 done:
  trim_separator(ms);
  if ((ms->flags & MAGIC_MIME_ENCODING) != 0) {
    if (ms->flags & MAGIC_MIME_TYPE)
      if (file_printf(ms, "; charset=") == -1)
        rv = -1;
    if (file_printf(ms, "%s", code_mime) == -1)
      rv = -1;
  }
#if HAVE_FORK
 done_encoding:
#endif
  free(rbuf);
  buffer_fini(&b);
  if (rv)
    return rv;

  return m;
}
#endif

file_protected int
file_reset(struct magic_set *ms, int checkloaded)
{
  if (checkloaded && ms->mlist[0] == NULL) {
    file_error(ms, 0, "no magic files loaded");
    return -1;
  }
  file_clearbuf(ms);
  if (ms->o.pbuf) {
    free(ms->o.pbuf);
    ms->o.pbuf = NULL;
  }
  ms->event_flags &= ~EVENT_HAD_ERR;
  ms->error = -1;
  return 0;
}

#define OCTALIFY(n, o)  \
  /*LINTED*/ \
  (void)(*(n)++ = '\\', \
  *(n)++ = ((CAST(uint32_t, *(o)) >> 6) & 3) + '0', \
  *(n)++ = ((CAST(uint32_t, *(o)) >> 3) & 7) + '0', \
  *(n)++ = ((CAST(uint32_t, *(o)) >> 0) & 7) + '0', \
  (o)++)

file_protected const char *
file_getbuffer(struct magic_set *ms)
{
  char *pbuf, *op, *np;
  size_t psize, len;

  if (ms->event_flags & EVENT_HAD_ERR)
    return NULL;

  if (ms->flags & MAGIC_RAW)
    return ms->o.buf;

  if (ms->o.buf == NULL)
    return NULL;

  /* * 4 is for octal representation, + 1 is for NUL */
  len = strlen(ms->o.buf);
  if (len > (SIZE_MAX - 1) / 4) {
    file_oomem(ms, len);
    return NULL;
  }
  psize = len * 4 + 1;
  if ((pbuf = CAST(char *, realloc(ms->o.pbuf, psize))) == NULL) {
    file_oomem(ms, psize);
    return NULL;
  }
  ms->o.pbuf = pbuf;

#if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
  {
    mbstate_t state;
    wchar_t nextchar;
    int mb_conv = 1;
    size_t bytesconsumed;
    char *eop;
    (void)memset(&state, 0, sizeof(mbstate_t));

    np = ms->o.pbuf;
    op = ms->o.buf;
    eop = op + len;

    while (op < eop) {
      bytesconsumed = mbrtowc(&nextchar, op,
          CAST(size_t, eop - op), &state);
      if (bytesconsumed == CAST(size_t, -1) ||
          bytesconsumed == CAST(size_t, -2)) {
        mb_conv = 0;
        break;
      }

      if (iswprint(nextchar)) {
        (void)memcpy(np, op, bytesconsumed);
        op += bytesconsumed;
        np += bytesconsumed;
      } else {
        while (bytesconsumed-- > 0)
          OCTALIFY(np, op);
      }
    }
    *np = '\0';

    /* Parsing succeeded as a multi-byte sequence */
    if (mb_conv != 0)
      return ms->o.pbuf;
  }
#endif

  for (np = ms->o.pbuf, op = ms->o.buf; *op;) {
    if (isprint(CAST(unsigned char, *op))) {
      *np++ = *op++;
    } else {
      OCTALIFY(np, op);
    }
  }
  *np = '\0';
  return ms->o.pbuf;
}

file_protected int
file_check_mem(struct magic_set *ms, unsigned int level)
{
  size_t len;

  if (level >= ms->c.len) {
    len = (ms->c.len = 20 + level) * sizeof(*ms->c.li);
    ms->c.li = CAST(struct level_info *, (ms->c.li == NULL) ?
        malloc(len) :
        realloc(ms->c.li, len));
    if (ms->c.li == NULL) {
      file_oomem(ms, len);
      return -1;
    }
  }
  ms->c.li[level].got_match = 0;
#ifdef ENABLE_CONDITIONALS
  ms->c.li[level].last_match = 0;
  ms->c.li[level].last_cond = COND_NONE;
#endif /* ENABLE_CONDITIONALS */
  return 0;
}

file_protected size_t
file_printedlen(const struct magic_set *ms)
{
  return ms->o.blen;
}

file_protected int
file_replace(struct magic_set *ms, const char *pat, const char *rep)
{
  file_regex_t rx;
  int rc, rv = -1;

  rc = file_regcomp(ms, &rx, pat, REG_EXTENDED);
  if (rc == 0) {
    regmatch_t rm;
    int nm = 0;
    while (file_regexec(ms, &rx, ms->o.buf, 1, &rm, 0) == 0) {
      ms->o.buf[rm.rm_so] = '\0';
      if (file_printf(ms, "%s%s", rep,
          rm.rm_eo != 0 ? ms->o.buf + rm.rm_eo : "") == -1)
        goto out;
      nm++;
    }
    rv = nm;
  }
out:
  file_regfree(&rx);
  return rv;
}

file_private int
check_regex(struct magic_set *ms, const char *pat)
{
  char sbuf[512];
  unsigned char oc = '\0';
  const char *p;
  unsigned long l;

  for (p = pat; *p; p++) {
    unsigned char c = *p;
    // Avoid repetition
    if (c == oc && strchr("?*+{", c) != NULL) {
      size_t len = strlen(pat);
      file_magwarn(ms,
          "repetition-operator operand `%c' "
          "invalid in regex `%s'", c,
          file_printable(ms, sbuf, sizeof(sbuf), pat, len));
      return -1;
    }
    if (c == '{') {
      char *ep, *eep;
      errno = 0;
      l = strtoul(p + 1, &ep, 10);
      if (ep != p + 1 && l > 1000)
        goto bounds;

      if (*ep == ',') {
        l = strtoul(ep + 1, &eep, 10);
        if (eep != ep + 1 && l > 1000)
          goto bounds;
      }
    }
    oc = c;
    if (isprint(c) || isspace(c) || c == '\b'
        || c == 0x8a) // XXX: apple magic fixme
      continue;
    size_t len = strlen(pat);
    file_magwarn(ms,
        "non-ascii characters in regex \\%#o `%s'",
        c, file_printable(ms, sbuf, sizeof(sbuf), pat, len));
    return -1;
  }
  return 0;
bounds:
  file_magwarn(ms, "bounds too large %ld in regex `%s'", l, pat);
  return -1;
}

file_protected int
file_regcomp(struct magic_set *ms file_locale_used, file_regex_t *rx,
    const char *pat, int flags)
{
  if (check_regex(ms, pat) == -1)
    return -1;

#ifdef USE_C_LOCALE
  locale_t old = uselocale(ms->c_lc_ctype);
  assert(old != NULL);
#else
  char old[1024];
  strlcpy(old, setlocale(LC_CTYPE, NULL), sizeof(old));
  (void)setlocale(LC_CTYPE, "C");
#endif
  int rc;
  rc = regcomp(rx, pat, flags);

#ifdef USE_C_LOCALE
  uselocale(old);
#else
  (void)setlocale(LC_CTYPE, old);
#endif
  if (rc > 0 && (ms->flags & MAGIC_CHECK)) {
    char errmsg[512], buf[512];

    (void)regerror(rc, rx, errmsg, sizeof(errmsg));
    file_magerror(ms, "regex error %d for `%s', (%s)", rc, 
        file_printable(ms, buf, sizeof(buf), pat, strlen(pat)),
        errmsg);
  }
  return rc;
}

/*ARGSUSED*/
file_protected int
file_regexec(struct magic_set *ms file_locale_used, file_regex_t *rx,
    const char *str, size_t nmatch, regmatch_t* pmatch, int eflags)
{
#ifdef USE_C_LOCALE
  locale_t old = uselocale(ms->c_lc_ctype);
  assert(old != NULL);
#else
  char old[1024];
  strlcpy(old, setlocale(LC_CTYPE, NULL), sizeof(old));
  (void)setlocale(LC_CTYPE, "C");
#endif
  int rc;
  /* XXX: force initialization because glibc does not always do this */
  if (nmatch != 0)
    memset(pmatch, 0, nmatch * sizeof(*pmatch));
  rc = regexec(rx, str, nmatch, pmatch, eflags);
#ifdef USE_C_LOCALE
  uselocale(old);
#else
  (void)setlocale(LC_CTYPE, old);
#endif
  return rc;
}

file_protected void
file_regfree(file_regex_t *rx)
{
  regfree(rx);
}

file_protected file_pushbuf_t *
file_push_buffer(struct magic_set *ms)
{
  file_pushbuf_t *pb;

  if (ms->event_flags & EVENT_HAD_ERR)
    return NULL;

  if ((pb = (CAST(file_pushbuf_t *, malloc(sizeof(*pb))))) == NULL)
    return NULL;

  pb->buf = ms->o.buf;
  pb->blen = ms->o.blen;
  pb->offset = ms->offset;

  ms->o.buf = NULL;
  ms->o.blen = 0;
  ms->offset = 0;

  return pb;
}

file_protected char *
file_pop_buffer(struct magic_set *ms, file_pushbuf_t *pb)
{
  char *rbuf;

  if (ms->event_flags & EVENT_HAD_ERR) {
    free(pb->buf);
    free(pb);
    return NULL;
  }

  rbuf = ms->o.buf;

  ms->o.buf = pb->buf;
  ms->o.blen = pb->blen;
  ms->offset = pb->offset;

  free(pb);
  return rbuf;
}

/*
 * convert string to ascii printable format.
 */
file_protected char *
file_printable(struct magic_set *ms, char *buf, size_t bufsiz,
    const char *str, size_t slen)
{
  char *ptr, *eptr = buf + bufsiz - 1;
  const unsigned char *s = RCAST(const unsigned char *, str);
  const unsigned char *es = s + slen;

  for (ptr = buf;  ptr < eptr && s < es && *s; s++) {
    if ((ms->flags & MAGIC_RAW) != 0 || isprint(*s)) {
      *ptr++ = *s;
      continue;
    }
    if (ptr >= eptr - 3)
      break;
    *ptr++ = '\\';
    *ptr++ = ((CAST(unsigned int, *s) >> 6) & 7) + '0';
    *ptr++ = ((CAST(unsigned int, *s) >> 3) & 7) + '0';
    *ptr++ = ((CAST(unsigned int, *s) >> 0) & 7) + '0';
  }
  *ptr = '\0';
  return buf;
}

struct guid {
  uint32_t data1;
  uint16_t data2;
  uint16_t data3;
  uint8_t data4[8];
};

file_protected int
file_parse_guid(const char *s, uint64_t *guid)
{
  struct guid *g = CAST(struct guid *, CAST(void *, guid));
#ifndef WIN32
  return sscanf(s,
      "%8x-%4hx-%4hx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx",
      &g->data1, &g->data2, &g->data3, &g->data4[0], &g->data4[1],
      &g->data4[2], &g->data4[3], &g->data4[4], &g->data4[5],
      &g->data4[6], &g->data4[7]) == 11 ? 0 : -1;
#else
  /* MS-Windows runtime doesn't support %hhx, except under
     non-default __USE_MINGW_ANSI_STDIO.  */
  uint16_t data16[8];
  int rv = sscanf(s, "%8x-%4hx-%4hx-%2hx%2hx-%2hx%2hx%2hx%2hx%2hx%2hx",
      &g->data1, &g->data2, &g->data3, &data16[0], &data16[1],
      &data16[2], &data16[3], &data16[4], &data16[5],
      &data16[6], &data16[7]) == 11 ? 0 : -1;
  int i;
  for (i = 0; i < 8; i++)
      g->data4[i] = data16[i];
  return rv;
#endif
}

file_protected int
file_print_guid(char *str, size_t len, const uint64_t *guid)
{
  const struct guid *g = CAST(const struct guid *,
      CAST(const void *, guid));

#ifndef WIN32
  return snprintf(str, len, "%.8X-%.4hX-%.4hX-%.2hhX%.2hhX-"
      "%.2hhX%.2hhX%.2hhX%.2hhX%.2hhX%.2hhX",
      g->data1, g->data2, g->data3, g->data4[0], g->data4[1],
      g->data4[2], g->data4[3], g->data4[4], g->data4[5],
      g->data4[6], g->data4[7]);
#else
  return snprintf(str, len, "%.8X-%.4hX-%.4hX-%.2hX%.2hX-"
      "%.2hX%.2hX%.2hX%.2hX%.2hX%.2hX",
      g->data1, g->data2, g->data3, g->data4[0], g->data4[1],
      g->data4[2], g->data4[3], g->data4[4], g->data4[5],
      g->data4[6], g->data4[7]);
#endif
}

file_protected int
file_pipe_closexec(int *fds)
{
#ifdef __MINGW32__
  return 0;
#elif defined(HAVE_PIPE2)
  return pipe2(fds, O_CLOEXEC);
#else
  if (pipe(fds) == -1)
    return -1;
# ifdef F_SETFD
  (void)fcntl(fds[0], F_SETFD, FD_CLOEXEC);
  (void)fcntl(fds[1], F_SETFD, FD_CLOEXEC);
# endif
  return 0;
#endif
}

file_protected int
file_clear_closexec(int fd) {
#ifdef F_SETFD
  return fcntl(fd, F_SETFD, 0);
#else
  return 0;
#endif
}

file_protected char *
file_strtrim(char *str)
{
  char *last;

  while (isspace(CAST(unsigned char, *str)))
    str++;
  last = str;
  while (*last)
    last++;
  --last;
  while (isspace(CAST(unsigned char, *last)))
    last--;
  *++last = '\0';
  return str;
}

Coverage Report

Created: 2023-09-25 07:18