/src/util-linux/lib/strutils.c

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/*
 * No copyright is claimed.  This code is in the public domain; do with
 * it what you wish.
 *
 * Authors: Karel Zak <kzak@redhat.com> [2010]
 *          Davidlohr Bueso <dave@gnu.org> [2010]
 */
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <ctype.h>
#include <errno.h>
#include <sys/stat.h>
#include <string.h>
#include <strings.h>
#include <assert.h>

#include "c.h"
#include "nls.h"
#include "strutils.h"
#include "bitops.h"
#include "pathnames.h"

static int STRTOXX_EXIT_CODE = EXIT_FAILURE;

void strutils_set_exitcode(int ex) {
  STRTOXX_EXIT_CODE = ex;
}

static int do_scale_by_power (uintmax_t *x, int base, int power)
{
  while (power--) {
    if (UINTMAX_MAX / base < *x)
      return -ERANGE;
    *x *= base;
  }
  return 0;
}

/*
 * strtosize() - convert string to size (uintmax_t).
 *
 * Supported suffixes:
 *
 * XiB or X for 2^N
 *     where X = {K,M,G,T,P,E,Z,Y}
 *        or X = {k,m,g,t,p,e}  (undocumented for backward compatibility only)
 * for example:
 *    10KiB = 10240
 *    10K = 10240
 *
 * XB for 10^N
 *     where X = {K,M,G,T,P,E,Z,Y}
 * for example:
 *    10KB  = 10000
 *
 * The optional 'power' variable returns number associated with used suffix
 * {K,M,G,T,P,E,Z,Y}  = {1,2,3,4,5,6,7,8}.
 *
 * The function also supports decimal point, for example:
 *              0.5MB   = 500000
 *              0.5MiB  = 512000
 *
 * Note that the function does not accept numbers with '-' (negative sign)
 * prefix.
 */
int ul_parse_size(const char *str, uintmax_t *res, int *power)
{
  const char *p;
  char *end;
  uintmax_t x, frac = 0;
  int base = 1024, rc = 0, pwr = 0, frac_zeros = 0;

  static const char *suf  = "KMGTPEZY";
  static const char *suf2 = "kmgtpezy";
  const char *sp;

  *res = 0;

  if (!str || !*str) {
    rc = -EINVAL;
    goto err;
  }

  /* Only positive numbers are acceptable
   *
   * Note that this check is not perfect, it would be better to
   * use lconv->negative_sign. But coreutils use the same solution,
   * so it's probably good enough...
   */
  p = str;
  while (isspace((unsigned char) *p))
    p++;
  if (*p == '-') {
    rc = -EINVAL;
    goto err;
  }

  errno = 0, end = NULL;
  x = strtoumax(str, &end, 0);

  if (end == str ||
      (errno != 0 && (x == UINTMAX_MAX || x == 0))) {
    rc = errno ? -errno : -EINVAL;
    goto err;
  }
  if (!end || !*end)
    goto done;      /* without suffix */
  p = end;

  /*
   * Check size suffixes
   */
check_suffix:
  if (*(p + 1) == 'i' && (*(p + 2) == 'B' || *(p + 2) == 'b') && !*(p + 3))
    base = 1024;      /* XiB, 2^N */
  else if ((*(p + 1) == 'B' || *(p + 1) == 'b') && !*(p + 2))
    base = 1000;      /* XB, 10^N */
  else if (*(p + 1)) {
    struct lconv const *l = localeconv();
    const char *dp = l ? l->decimal_point : NULL;
    size_t dpsz = dp ? strlen(dp) : 0;

    if (frac == 0 && *p && dp && strncmp(dp, p, dpsz) == 0) {
      const char *fstr = p + dpsz;

      for (p = fstr; *p == '0'; p++)
        frac_zeros++;
      fstr = p;
      if (isdigit(*fstr)) {
        errno = 0, end = NULL;
        frac = strtoumax(fstr, &end, 0);
        if (end == fstr ||
            (errno != 0 && (frac == UINTMAX_MAX || frac == 0))) {
          rc = errno ? -errno : -EINVAL;
          goto err;
        }
      } else
        end = (char *) p;

      if (frac && (!end  || !*end)) {
        rc = -EINVAL;
        goto err;   /* without suffix, but with frac */
      }
      p = end;
      goto check_suffix;
    }
    rc = -EINVAL;
    goto err;     /* unexpected suffix */
  }

  sp = strchr(suf, *p);
  if (sp)
    pwr = (sp - suf) + 1;
  else {
    sp = strchr(suf2, *p);
    if (sp)
      pwr = (sp - suf2) + 1;
    else {
      rc = -EINVAL;
      goto err;
    }
  }

  rc = do_scale_by_power(&x, base, pwr);
  if (power)
    *power = pwr;
  if (frac && pwr) {
    int i;
    uintmax_t frac_div = 10, frac_poz = 1, frac_base = 1;

    /* mega, giga, ... */
    do_scale_by_power(&frac_base, base, pwr);

    /* maximal divisor for last digit (e.g. for 0.05 is
     * frac_div=100, for 0.054 is frac_div=1000, etc.)
     *
     * Reduce frac if too large.
     */
    while (frac_div < frac) {
      if (frac_div <= UINTMAX_MAX/10)
        frac_div *= 10;
      else
        frac /= 10;
    }

    /* 'frac' is without zeros (5 means 0.5 as well as 0.05) */
    for (i = 0; i < frac_zeros; i++) {
      if (frac_div <= UINTMAX_MAX/10)
        frac_div *= 10;
      else
        frac /= 10;
    }

    /*
     * Go backwardly from last digit and add to result what the
     * digit represents in the frac_base. For example 0.25G
     *
     *  5 means 1GiB / (100/5)
     *  2 means 1GiB / (10/2)
     */
    do {
      unsigned int seg = frac % 10;    /* last digit of the frac */
      uintmax_t seg_div = frac_div / frac_poz; /* what represents the segment 1000, 100, .. */

      frac /= 10; /* remove last digit from frac */
      frac_poz *= 10;

      if (seg && seg_div / seg)
        x += frac_base / (seg_div / seg);
    } while (frac);
  }
done:
  *res = x;
err:
  if (rc < 0)
    errno = -rc;
  return rc;
}

int strtosize(const char *str, uintmax_t *res)
{
  return ul_parse_size(str, res, NULL);
}

int isdigit_strend(const char *str, const char **end)
{
  const char *p;

  for (p = str; p && *p && isdigit((unsigned char) *p); p++);

  if (end)
    *end = p;
  return p && p > str && !*p;
}

int isxdigit_strend(const char *str, const char **end)
{
  const char *p;

  for (p = str; p && *p && isxdigit((unsigned char) *p); p++);

  if (end)
    *end = p;

  return p && p > str && !*p;
}

/*
 *  For example: ul_parse_switch(argv[i], "on", "off",  "yes", "no",  NULL);
 */
int ul_parse_switch(const char *arg, ...)
{
  const char *a, *b;
  va_list ap;

  va_start(ap, arg);
  do {
    a = va_arg(ap, char *);
    if (!a)
      break;
    b = va_arg(ap, char *);
    if (!b)
      break;

    if (strcmp(arg, a) == 0) {
      va_end(ap);
      return 1;
    }

    if (strcmp(arg, b) == 0) {
      va_end(ap);
      return 0;
    }
  } while (1);
  va_end(ap);

  errx(STRTOXX_EXIT_CODE, _("unsupported argument: %s"), arg);
}

#ifndef HAVE_MEMPCPY
void *mempcpy(void *restrict dest, const void *restrict src, size_t n)
{
    return ((char *)memcpy(dest, src, n)) + n;
}
#endif

#ifndef HAVE_STRNLEN
size_t strnlen(const char *s, size_t maxlen)
{
        size_t i;

        for (i = 0; i < maxlen; i++) {
                if (s[i] == '\0')
                        return i;
        }
        return maxlen;
}
#endif

#ifndef HAVE_STRNCHR
char *strnchr(const char *s, size_t maxlen, int c)
{
  for (; maxlen-- && *s != '\0'; ++s)
    if (*s == (char)c)
      return (char *)s;
  return NULL;
}
#endif

#ifndef HAVE_STRNDUP
char *strndup(const char *s, size_t n)
{
  size_t len = strnlen(s, n);
  char *new = malloc((len + 1) * sizeof(char));
  if (!new)
    return NULL;
  new[len] = '\0';
  return (char *) memcpy(new, s, len);
}
#endif

/*
 * convert strings to numbers; returns <0 on error, and 0 on success
 */
int ul_strtos64(const char *str, int64_t *num, int base)
{
  char *end = NULL;

  if (str == NULL || *str == '\0')
    return -(errno = EINVAL);

  errno = 0;
  *num = (int64_t) strtoimax(str, &end, base);

  if (errno != 0)
    return -errno;
  if (str == end || (end && *end))
    return -(errno = EINVAL);
  return 0;
}

int ul_strtou64(const char *str, uint64_t *num, int base)
{
  char *end = NULL;
  int64_t tmp;

  if (str == NULL || *str == '\0')
    return -(errno = EINVAL);

  /* we need to ignore negative numbers, note that for invalid negative
   * number strtoimax() returns negative number too, so we do not
   * need to check errno here */
  errno = 0;
  tmp = (int64_t) strtoimax(str, &end, base);
  if (tmp < 0)
    errno = ERANGE;
  else {
    errno = 0;
    *num = strtoumax(str, &end, base);
  }

  if (errno != 0)
    return -errno;
  if (str == end || (end && *end))
    return -(errno = EINVAL);
  return 0;
}

int ul_strtos32(const char *str, int32_t *num, int base)
{
  int64_t tmp;
  int rc;

  rc = ul_strtos64(str, &tmp, base);
  if (rc == 0 && (tmp < INT32_MIN || tmp > INT32_MAX))
    rc = -(errno = ERANGE);
  if (rc == 0)
    *num = (int32_t) tmp;
  return rc;
}

int ul_strtou32(const char *str, uint32_t *num, int base)
{
  uint64_t tmp;
  int rc;

  rc = ul_strtou64(str, &tmp, base);
  if (rc == 0 && tmp > UINT32_MAX)
    rc = -(errno = ERANGE);
  if (rc == 0)
    *num = (uint32_t) tmp;
  return rc;
}

int ul_strtou16(const char *str, uint16_t *num, int base)
{
  uint64_t tmp;
  int rc;

  rc = ul_strtou64(str, &tmp, base);
  if (rc == 0 && tmp > UINT16_MAX)
    rc = -(errno = ERANGE);
  if (rc == 0)
    *num = (uint16_t) tmp;
  return rc;
}

/*
 * Convert strings to numbers in defined range and print message on error.
 *
 * These functions are used when we read input from users (getopt() etc.). It's
 * better to consolidate the code and keep it all based on 64-bit numbers than
 * implement it for 32 and 16-bit numbers too.
 */
int64_t str2num_or_err(const char *str, int base, const char *errmesg,
           int64_t low, int64_t up)
{
  int64_t num = 0;
  int rc;

  rc = ul_strtos64(str, &num, base);
  if (rc == 0 && ((low && num < low) || (up && num > up)))
    rc = -(errno = ERANGE);

  if (rc) {
    if (errno == ERANGE)
      err(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
    errx(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
  }
  return num;
}

uint64_t str2unum_or_err(const char *str, int base, const char *errmesg, uint64_t up)
{
  uint64_t num = 0;
  int rc;

  rc = ul_strtou64(str, &num, base);
  if (rc == 0 && (up && num > up))
    rc = -(errno = ERANGE);

  if (rc) {
    if (errno == ERANGE)
      err(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
    errx(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
  }
  return num;
}

double strtod_or_err(const char *str, const char *errmesg)
{
  double num;
  char *end = NULL;

  errno = 0;
  if (str == NULL || *str == '\0')
    goto err;
  num = strtod(str, &end);

  if (errno || str == end || (end && *end))
    goto err;

  return num;
err:
  if (errno == ERANGE)
    err(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);

  errx(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
}

int ul_strtold(const char *str, long double *num)
{
  char *end = NULL;

  errno = 0;
  if (str == NULL || *str == '\0')
    return -(errno = EINVAL);
  *num = strtold(str, &end);

  if (errno != 0)
    return -errno;
  if (str == end || (end && *end))
    return -(errno = EINVAL);
  return 0;
}

long double strtold_or_err(const char *str, const char *errmesg)
{
  long double num = 0;

  if (ul_strtold(str, &num) == 0)
    return num;
  if (errno == ERANGE)
    err(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);

  errx(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
}

uintmax_t strtosize_or_err(const char *str, const char *errmesg)
{
  uintmax_t num;

  if (strtosize(str, &num) == 0)
    return num;

  if (errno)
    err(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);

  errx(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
}


void strtotimeval_or_err(const char *str, struct timeval *tv, const char *errmesg)
{
  long double user_input;

  user_input = strtold_or_err(str, errmesg);
  tv->tv_sec = (time_t) user_input;
  tv->tv_usec = (suseconds_t)((user_input - tv->tv_sec) * 1000000);
}

void strtotimespec_or_err(const char *str, struct timespec *ts, const char *errmesg)
{
  long double user_input;

  user_input = strtold_or_err(str, errmesg);
  ts->tv_sec = (time_t) user_input;
  ts->tv_nsec = (long)((user_input - ts->tv_sec) * 1000000000);
}

time_t strtotime_or_err(const char *str, const char *errmesg)
{
  int64_t user_input;

  user_input = strtos64_or_err(str, errmesg);
  return (time_t) user_input;
}

bool hyperlinkwanted(const char *mode)
{
  if (mode && strcmp(mode, "never") == 0)
    return false;

  if (mode && strcmp(mode, "always") == 0)
    return true;

  if (!mode || strcmp(mode, "auto") == 0)
    return isatty(STDOUT_FILENO) ? true : false;

  errx(EXIT_FAILURE, _("invalid argument of --hyperlink: %s"), mode);
}

/*
 * Converts stat->st_mode to ls(1)-like mode string. The size of "str" must
 * be 11 bytes.
 */
char *xstrmode(mode_t mode, char *str)
{
  unsigned short i = 0;

  if (S_ISDIR(mode))
    str[i++] = 'd';
  else if (S_ISLNK(mode))
    str[i++] = 'l';
  else if (S_ISCHR(mode))
    str[i++] = 'c';
  else if (S_ISBLK(mode))
    str[i++] = 'b';
  else if (S_ISSOCK(mode))
    str[i++] = 's';
  else if (S_ISFIFO(mode))
    str[i++] = 'p';
  else if (S_ISREG(mode))
    str[i++] = '-';

  str[i++] = mode & S_IRUSR ? 'r' : '-';
  str[i++] = mode & S_IWUSR ? 'w' : '-';
  str[i++] = (mode & S_ISUID
    ? (mode & S_IXUSR ? 's' : 'S')
    : (mode & S_IXUSR ? 'x' : '-'));
  str[i++] = mode & S_IRGRP ? 'r' : '-';
  str[i++] = mode & S_IWGRP ? 'w' : '-';
  str[i++] = (mode & S_ISGID
    ? (mode & S_IXGRP ? 's' : 'S')
    : (mode & S_IXGRP ? 'x' : '-'));
  str[i++] = mode & S_IROTH ? 'r' : '-';
  str[i++] = mode & S_IWOTH ? 'w' : '-';
  str[i++] = (mode & S_ISVTX
    ? (mode & S_IXOTH ? 't' : 'T')
    : (mode & S_IXOTH ? 'x' : '-'));
  str[i] = '\0';

  return str;
}

/*
 * returns exponent (2^x=n) in range KiB..EiB (2^10..2^60)
 */
static int get_exp(uint64_t n)
{
  int shft;

  for (shft = 10; shft <= 60; shft += 10) {
    if (n < (1ULL << shft))
      break;
  }
  return shft - 10;
}

char *size_to_human_string(int options, uint64_t bytes)
{
  char buf[32];
  int dec, exp;
  uint64_t frac;
  const char *letters = "BKMGTPE";
  char suffix[sizeof(" KiB")], *psuf = suffix;
  char c;

  if (options & SIZE_SUFFIX_SPACE)
    *psuf++ = ' ';


  exp  = get_exp(bytes);
  c    = *(letters + (exp ? exp / 10 : 0));
  dec  = exp ? bytes / (1ULL << exp) : bytes;
  frac = exp ? bytes % (1ULL << exp) : 0;

  *psuf++ = c;

  if ((options & SIZE_SUFFIX_3LETTER) && (c != 'B')) {
    *psuf++ = 'i';
    *psuf++ = 'B';
  }

  *psuf = '\0';

  /* fprintf(stderr, "exp: %d, unit: %c, dec: %d, frac: %jd\n",
   *                 exp, suffix[0], dec, frac);
   */

  /* round */
  if (frac) {
    /* get 3 digits after decimal point */
    if (frac >= UINT64_MAX / 1000)
      frac = ((frac / 1024) * 1000) / (1ULL << (exp - 10)) ;
    else
      frac = (frac * 1000) / (1ULL << (exp)) ;

    if (options & SIZE_DECIMAL_2DIGITS) {
      /* round 4/5 and keep 2 digits after decimal point */
      frac = (frac + 5) / 10 ;
    } else {
      /* round 4/5 and keep 1 digit after decimal point */
      frac = ((frac + 50) / 100) * 10 ;
    }

    /* rounding could have overflowed */
    if (frac == 100) {
      dec++;
      frac = 0;
    }
  }

  if (frac) {
    struct lconv const *l = localeconv();
    char *dp = l ? l->decimal_point : NULL;
    int len;

    if (!dp || !*dp)
      dp = ".";

    len = snprintf(buf, sizeof(buf), "%d%s%02" PRIu64, dec, dp, frac);
    if (len > 0 && (size_t) len < sizeof(buf)) {
      /* remove potential extraneous zero */
      if (buf[len - 1] == '0')
        buf[len--] = '\0';
      /* append suffix */
      xstrncpy(buf+len, suffix, sizeof(buf) - len);
    } else
      *buf = '\0'; /* snprintf error */
  } else
    snprintf(buf, sizeof(buf), "%d%s", dec, suffix);

  return strdup(buf);
}

/*
 * Parses comma delimited list to array with IDs, for example:
 *
 * "aaa,bbb,ccc" --> ary[0] = FOO_AAA;
 *                   ary[1] = FOO_BBB;
 *                   ary[3] = FOO_CCC;
 *
 * The function name2id() provides conversion from string to ID.
 *
 * Returns: >= 0  : number of items added to ary[]
 *            -1  : parse error or unknown item
 *            -2  : arysz reached
 */
int string_to_idarray(const char *list, int ary[], size_t arysz,
      int (name2id)(const char *, size_t))
{
  const char *begin = NULL, *p;
  size_t n = 0;

  if (!list || !*list || !ary || !arysz || !name2id)
    return -1;

  for (p = list; p && *p; p++) {
    const char *end = NULL;
    int id;

    if (n >= arysz)
      return -2;
    if (!begin)
      begin = p;   /* begin of the column name */
    if (*p == ',')
      end = p;   /* terminate the name */
    if (*(p + 1) == '\0')
      end = p + 1;   /* end of string */
    if (!begin || !end)
      continue;
    if (end <= begin)
      return -1;

    id = name2id(begin, end - begin);
    if (id == -1)
      return -1;
    ary[ n++ ] = id;
    begin = NULL;
    if (end && !*end)
      break;
  }
  return n;
}

/*
 * Parses the array like string_to_idarray but if format is "+aaa,bbb"
 * it adds fields to array instead of replacing them.
 */
int string_add_to_idarray(const char *list, int ary[], size_t arysz,
      size_t *ary_pos, int (name2id)(const char *, size_t))
{
  const char *list_add;
  int r;

  if (!list || !*list || !ary_pos || *ary_pos > arysz)
    return -1;

  if (list[0] == '+')
    list_add = &list[1];
  else {
    list_add = list;
    *ary_pos = 0;
  }

  r = string_to_idarray(list_add, &ary[*ary_pos], arysz - *ary_pos, name2id);
  if (r > 0)
    *ary_pos += r;
  return r;
}

/*
 * LIST ::= <item> [, <item>]
 *
 * The <item> is translated to 'id' by name2id() function and the 'id' is used
 * as a position in the 'ary' bit array. It means that the 'id' has to be in
 * range <0..N> where N < sizeof(ary) * NBBY.
 *
 * If allow_range is enabled:
 * An item ending in '+' also sets all bits in <0..N>.
 * An item beginning with '+' also sets all bits in <N..allow_minus>.
 *
 * Returns: 0 on success, <0 on error.
 */
int string_to_bitarray(const char *list,
         char *ary,
         int (*name2bit)(const char *, size_t),
         size_t allow_range)
{
  const char *begin = NULL, *p;

  if (!list || !name2bit || !ary)
    return -EINVAL;

  for (p = list; p && *p; p++) {
    const char *end = NULL;
    int bit, set_lower = 0, set_higher = 0;

    if (!begin)
      begin = p;   /* begin of the level name */
    if (*p == ',')
      end = p;   /* terminate the name */
    if (*(p + 1) == '\0')
      end = p + 1;   /* end of string */
    if (!begin || !end)
      continue;
    if (end <= begin)
      return -1;
    if (allow_range) {
      if (*(end - 1) == '+') {
        end--;
        set_lower = 1;
      } else if (*begin == '+') {
        begin++;
        set_higher = 1;
      }
    }

    bit = name2bit(begin, end - begin);
    if (bit < 0)
      return bit;
    setbit(ary, bit);
    if (set_lower)
      while (--bit >= 0)
        setbit(ary, bit);
    else if (set_higher)
      while (++bit < (int) allow_range)
        setbit(ary, bit);
    begin = NULL;
    if (end && !*end)
      break;
  }
  return 0;
}

/*
 * LIST ::= <item> [, <item>]
 *
 * The <item> is translated to 'id' by name2flag() function and the flags is
 * set to the 'mask'
*
 * Returns: 0 on success, <0 on error.
 */
int string_to_bitmask(const char *list,
         unsigned long *mask,
         long (*name2flag)(const char *, size_t))
{
  const char *begin = NULL, *p;

  if (!list || !name2flag || !mask)
    return -EINVAL;

  for (p = list; p && *p; p++) {
    const char *end = NULL;
    long flag;

    if (!begin)
      begin = p;   /* begin of the level name */
    if (*p == ',')
      end = p;   /* terminate the name */
    if (*(p + 1) == '\0')
      end = p + 1;   /* end of string */
    if (!begin || !end)
      continue;
    if (end <= begin)
      return -1;

    flag = name2flag(begin, end - begin);
    if (flag < 0)
      return flag; /* error */
    *mask |= flag;
    begin = NULL;
    if (end && !*end)
      break;
  }
  return 0;
}

/*
 * Parse the lower and higher values in a string containing
 * "lower:higher" or "lower-higher" format. Note that either
 * the lower or the higher values may be missing, and the def
 * value will be assigned to it by default.
 *
 * Returns: 0 on success, <0 on error.
 */
int ul_parse_range(const char *str, int *lower, int *upper, int def)
{
  char *end = NULL;

  if (!str)
    return 0;

  *upper = *lower = def;
  errno = 0;

  if (*str == ':') {       /* <:N> */
    str++;
    *upper = strtol(str, &end, 10);
    if (errno || !end || *end || end == str)
      return -1;
  } else {
    *upper = *lower = strtol(str, &end, 10);
    if (errno || !end || end == str)
      return -1;

    if (*end == ':' && !*(end + 1))   /* <M:> */
      *upper = def;
    else if (*end == '-' || *end == ':') { /* <M:N> <M-N> */
      str = end + 1;
      end = NULL;
      errno = 0;
      *upper = strtol(str, &end, 10);

      if (errno || !end || *end || end == str)
        return -1;
    }
  }
  return 0;
}

static const char *next_path_segment(const char *str, size_t *sz)
{
  const char *start, *p;

  start = str;
  *sz = 0;
  while (start && *start == '/' && *(start + 1) == '/')
    start++;

  if (!start || !*start)
    return NULL;

  for (*sz = 1, p = start + 1; *p && *p != '/'; p++) {
    (*sz)++;
  }

  return start;
}

int streq_paths(const char *a, const char *b)
{
  while (a && b) {
    size_t a_sz, b_sz;
    const char *a_seg = next_path_segment(a, &a_sz);
    const char *b_seg = next_path_segment(b, &b_sz);

    /*
    fprintf(stderr, "A>>>(%zu) '%s'\n", a_sz, a_seg);
    fprintf(stderr, "B>>>(%zu) '%s'\n", b_sz, b_seg);
    */

    /* end of the path */
    if (a_sz + b_sz == 0)
      return 1;

    /* ignore trailing slash */
    if (a_sz + b_sz == 1 &&
        ((a_seg && *a_seg == '/') || (b_seg && *b_seg == '/')))
      return 1;

    if (!a_seg || !b_seg)
      break;
    if (a_sz != b_sz || strncmp(a_seg, b_seg, a_sz) != 0)
      break;

    a = a_seg + a_sz;
    b = b_seg + b_sz;
  };

  return 0;
}

/* concatenate two strings to a new string, the size of the second string is limited by @b */
char *ul_strnconcat(const char *s, const char *suffix, size_t b)
{
        size_t a;
        char *r;

        if (!s && !suffix)
                return strdup("");
        if (!s)
                return strndup(suffix, b);
        if (!suffix)
                return strdup(s);

        assert(s);
        assert(suffix);

        a = strlen(s);
        if (b > ((size_t) -1) - a)
                return NULL;

        r = malloc(a + b + 1);
        if (!r)
                return NULL;

        memcpy(r, s, a);
        memcpy(r + a, suffix, b);
        r[a+b] = 0;

        return r;
}

/* concatenate two strings to a new string */
char *ul_strconcat(const char *s, const char *suffix)
{
        return ul_strnconcat(s, suffix, suffix ? strlen(suffix) : 0);
}

/* concatenate @s and string defined by @format to a new string */
char *ul_strfconcat(const char *s, const char *format, ...)
{
  va_list ap;
  char *val, *res;
  int sz;

  va_start(ap, format);
  sz = vasprintf(&val, format, ap);
  va_end(ap);

  if (sz < 0)
    return NULL;

  res = ul_strnconcat(s, val, sz);
  free(val);
  return res;
}

int ul_strappend(char **a, const char *b)
{
  size_t al, bl;
  char *tmp;

  if (!a)
    return -EINVAL;
  if (!b || !*b)
    return 0;
  if (!*a) {
    *a = strdup(b);
    return !*a ? -ENOMEM : 0;
  }

  al = strlen(*a);
  bl = strlen(b);

  tmp = realloc(*a, al + bl + 1);
  if (!tmp)
    return -ENOMEM;
  *a = tmp;
  memcpy((*a) + al, b, bl + 1);
  return 0;
}

/* the hybrid version of strfconcat and strappend. */
int strfappend(char **a, const char *format, ...)
{
  va_list ap;
  int res;

  va_start(ap, format);
  res = ul_strvfappend(a, format, ap);
  va_end(ap);

  return res;
}

extern int ul_strvfappend(char **a, const char *format, va_list ap)
{
  char *val;
  int sz;
  int res;

  sz = vasprintf(&val, format, ap);
  if (sz < 0)
    return -errno;

  res = ul_strappend(a, val);
  free(val);
  return res;
}

static size_t strcspn_escaped(const char *s, const char *reject)
{
        int escaped = 0;
        int n;

        for (n=0; s[n]; n++) {
                if (escaped)
                        escaped = 0;
                else if (s[n] == '\\')
                        escaped = 1;
                else if (strchr(reject, s[n]))
                        break;
        }

        /* if s ends in \, return index of previous char */
        return n - escaped;
}

/*
 * Like strchr() but ignores @c if escaped by '\', '\\' is interpreted like '\'.
 *
 * For example for @c='X':
 *
 *      "abcdXefgXh"    --> "XefgXh"
 *  "abcd\XefgXh"   --> "Xh"
 *  "abcd\\XefgXh"  --> "XefgXh"
 *  "abcd\\\XefgXh" --> "Xh"
 *  "abcd\Xefg\Xh"  --> (null)
 *
 *  "abcd\\XefgXh"  --> "\XefgXh"   for @c='\\'
 */
char *ul_strchr_escaped(const char *s, int c)
{
  char *p;
  int esc = 0;

  for (p = (char *) s; p && *p; p++) {
    if (!esc && *p == '\\') {
      esc = 1;
      continue;
    }
    if (*p == c && (!esc || c == '\\'))
      return p;
    esc = 0;
  }

  return NULL;
}

/* Split a string into words. */
const char *ul_split(const char **state, size_t *l, const char *separator, int quoted)
{
        const char *current;

        current = *state;

        if (!*current) {
                assert(**state == '\0');
                return NULL;
        }

        current += strspn(current, separator);
        if (!*current) {
                *state = current;
                return NULL;
        }

        if (quoted && strchr("\'\"", *current)) {
                char quotechars[2] = {*current, '\0'};

                *l = strcspn_escaped(current + 1, quotechars);
                if (current[*l + 1] == '\0' || current[*l + 1] != quotechars[0] ||
                    (current[*l + 2] && !strchr(separator, current[*l + 2]))) {
                        /* right quote missing or garbage at the end */
                        *state = current;
                        return NULL;
                }
                *state = current++ + *l + 2;
        } else if (quoted) {
                *l = strcspn_escaped(current, separator);
                if (current[*l] && !strchr(separator, current[*l])) {
                        /* unfinished escape */
                        *state = current;
                        return NULL;
                }
                *state = current + *l;
        } else {
                *l = strcspn(current, separator);
                *state = current + *l;
        }

        return current;
}

/* Rewind file pointer forward to new line.  */
int skip_fline(FILE *fp)
{
  int ch;

  do {
    if ((ch = fgetc(fp)) == EOF)
      return 1;
    if (ch == '\n')
      return 0;
  } while (1);
}


/* compare two strings, but ignoring non-alnum and case of the characters, for example
 * "Hello (123)!" is the same as "hello123".
 */
int ul_stralnumcmp(const char *p1, const char *p2)
{
  const unsigned char *s1 = (const unsigned char *) p1;
  const unsigned char *s2 = (const unsigned char *) p2;
  unsigned char c1, c2;

  do {
    do {
      c1 = (unsigned char) *s1++;
    } while (c1 != '\0' && !isalnum((unsigned int) c1));

    do {
      c2 = (unsigned char) *s2++;
    } while (c2 != '\0' && !isalnum((unsigned int) c2));

    if (c1 != '\0')
      c1 = tolower(c1);
    if (c2 != '\0')
      c2 = tolower(c2);
    if (c1 == '\0')
      return c1 - c2;
  } while (c1 == c2);

  return c1 - c2;
}

/*
 * Parses the first option from @optstr. The @optstr pointer is set to the beginning
 * of the next option. The options string looks like 'aaa,bbb=data,foo,bar="xxx"'.
 *
 * Note this function is used by libmount to parse mount options. Be careful when modify.
 *
 * Returns -EINVAL on parse error, 1 at the end of optstr and 0 on success.
 */
int ul_optstr_next(char **optstr, char **name, size_t *namesz,
       char **value, size_t *valsz)
{
  int open_quote = 0;
  char *start = NULL, *stop = NULL, *p, *sep = NULL;
  char *optstr0;

  assert(optstr);
  assert(*optstr);

  optstr0 = *optstr;

  if (name)
    *name = NULL;
  if (namesz)
    *namesz = 0;
  if (value)
    *value = NULL;
  if (valsz)
    *valsz = 0;

  /* trim leading commas as to not invalidate option
   * strings with multiple consecutive commas */
  while (optstr0 && *optstr0 == ',')
    optstr0++;

  for (p = optstr0; p && *p; p++) {
    if (!start && *p == '=')
      return -EINVAL;
    if (!start)
      start = p;   /* beginning of the option item */
    if (*p == '"' && (p == optstr0 || *(p - 1) != '\\'))
      open_quote ^= 1; /* reverse the status */
    if (open_quote)
      continue;    /* still in quoted block */
    if (!sep && p > start && *p == '=')
      sep = p;   /* name and value separator */
    if (*p == ',' && (p == optstr0 || *(p - 1) != '\\'))
      stop = p;    /* terminate the option item */
    else if (*(p + 1) == '\0')
      stop = p + 1;   /* end of optstr */
    if (!start || !stop)
      continue;
    if (stop <= start)
      return -EINVAL;

    if (name)
      *name = start;
    if (namesz)
      *namesz = sep ? sep - start : stop - start;
    *optstr = *stop ? stop + 1 : stop;

    if (sep) {
      if (value)
        *value = sep + 1;
      if (valsz)
        *valsz = stop - sep - 1;
    }
    return 0;
  }

  return 1;       /* end of optstr */
}

int ul_optstr_is_valid(const char *optstr)
{
  int rc;
  char *p = (char *) optstr;

  while ((rc = ul_optstr_next(&p, NULL, NULL, NULL, NULL)) == 0);
  return rc < 0 ? 0 : 1;
}

#ifdef TEST_PROGRAM_STRUTILS

#include "cctype.h"

struct testS {
  char *name;
  char *value;
};

static int test_strdup_to_member(int argc, char *argv[])
{
  struct testS *xx;

  if (argc < 3)
    return EXIT_FAILURE;

  xx = calloc(1, sizeof(*xx));
  if (!xx)
    err(EXIT_FAILURE, "calloc() failed");

  strdup_to_struct_member(xx, name, argv[1]);
  strdup_to_struct_member(xx, value, argv[2]);

  if (strcmp(xx->name, argv[1]) != 0 &&
      strcmp(xx->value, argv[2]) != 0)
    errx(EXIT_FAILURE, "strdup_to_struct_member() failed");

  printf("1: '%s', 2: '%s'\n", xx->name, xx->value);

  free(xx->name);
  free(xx->value);
  free(xx);
  return EXIT_SUCCESS;
}

static int test_strutils_sizes(int argc, char *argv[])
{
  uintmax_t size = 0;
  char *hum1, *hum2, *hum3;

  if (argc < 2)
    return EXIT_FAILURE;

  if (strtosize(argv[1], &size))
    errx(EXIT_FAILURE, "invalid size '%s' value", argv[1]);

  hum1 = size_to_human_string(SIZE_SUFFIX_1LETTER, size);
  hum2 = size_to_human_string(SIZE_SUFFIX_3LETTER |
            SIZE_SUFFIX_SPACE, size);
  hum3 = size_to_human_string(SIZE_SUFFIX_3LETTER |
            SIZE_SUFFIX_SPACE |
            SIZE_DECIMAL_2DIGITS, size);

  printf("%25s : %20ju : %8s : %12s : %13s\n", argv[1], size, hum1, hum2, hum3);
  free(hum1);
  free(hum2);
  free(hum3);

  return EXIT_SUCCESS;
}

static int test_strutils_cmp_paths(int argc, char *argv[])
{
  int rc = streq_paths(argv[1], argv[2]);

  if (argc < 3)
    return EXIT_FAILURE;

  printf("%s: '%s' '%s'\n", rc == 1 ? "YES" : "NOT", argv[1], argv[2]);
  return EXIT_SUCCESS;
}

static int test_strutils_normalize(int argc, char *argv[])
{
  unsigned char *src, *dst, *org;
  size_t sz, len;

  if (argc < 2)
    return EXIT_FAILURE;

  org = (unsigned char *) strdup(argv[1]);
  src = (unsigned char *) strdup((char *) org);
  len = strlen((char *) src);
  dst = malloc(len + 1);

  if (!org || !src || !dst)
    goto done;

  /* two buffers */
  sz = __normalize_whitespace(src, len, dst, len + 1);
  printf("1: '%s' --> '%s' [sz=%zu]\n", src, dst, sz);

  /* one buffer */
  sz = normalize_whitespace(src);
  printf("2: '%s' --> '%s' [sz=%zu]\n", org, src, sz);

done:
  free(src);
  free(dst);
  free(org);

  return EXIT_SUCCESS;
}

static int test_strutils_cstrcasecmp(int argc, char *argv[])
{
  char *a, *b;

  if (argc < 3)
    return EXIT_FAILURE;

  a = argv[1];
  b = argv[2];

  if (!a || !b)
    return EXIT_FAILURE;

  printf("cmp    '%s' '%s' = %d\n", a, b, strcasecmp(a, b));
  printf("c_cmp  '%s' '%s' = %d\n", a, b, c_strcasecmp(a, b));
  printf("c_ncmp '%s' '%s' = %d\n", a, b, c_strncasecmp(a, b, strlen(a)));

  return EXIT_SUCCESS;
}

int main(int argc, char *argv[])
{
  if (argc == 3 && strcmp(argv[1], "--size") == 0) {
    return test_strutils_sizes(argc - 1, argv + 1);

  } else if (argc == 3 && strcmp(argv[1], "--parse-switch") == 0) {
    printf("'%s'-->%d\n", argv[2], ul_parse_switch(argv[2],
            "on", "off",
            "enable", "disable",
            "yes", "no",
            "1", "0",
            NULL));
    return EXIT_SUCCESS;
  } else if (argc == 4 && strcmp(argv[1], "--cmp-paths") == 0) {
    return test_strutils_cmp_paths(argc - 1, argv + 1);

  } else if (argc == 4 && strcmp(argv[1], "--strdup-member") == 0) {
    return test_strdup_to_member(argc - 1, argv + 1);

  } else if  (argc == 4 && strcmp(argv[1], "--stralnumcmp") == 0) {
    printf("%s\n", ul_stralnumcmp(argv[2], argv[3]) == 0 ?
        "match" : "dismatch");
    return EXIT_SUCCESS;

  } else if (argc == 4 && strcmp(argv[1], "--cstrcasecmp") == 0) {
    return test_strutils_cstrcasecmp(argc - 1, argv + 1);

  } else if (argc == 3 && strcmp(argv[1], "--normalize") == 0) {
    return test_strutils_normalize(argc - 1, argv + 1);

  } else if (argc == 3 && strcmp(argv[1], "--strtos64") == 0) {
    printf("'%s'-->%jd\n", argv[2], strtos64_or_err(argv[2], "strtos64 failed"));
    return EXIT_SUCCESS;
  } else if (argc == 3 && strcmp(argv[1], "--strtou64") == 0) {
    printf("'%s'-->%ju\n", argv[2], strtou64_or_err(argv[2], "strtou64 failed"));
    return EXIT_SUCCESS;
  } else if (argc == 3 && strcmp(argv[1], "--strtos32") == 0) {
    printf("'%s'-->%d\n", argv[2], strtos32_or_err(argv[2], "strtos32 failed"));
    return EXIT_SUCCESS;
  } else if (argc == 3 && strcmp(argv[1], "--strtou32") == 0) {
    printf("'%s'-->%u\n", argv[2], strtou32_or_err(argv[2], "strtou32 failed"));
    return EXIT_SUCCESS;
  } else if (argc == 3 && strcmp(argv[1], "--strtos16") == 0) {
    printf("'%s'-->%hd\n", argv[2], strtos16_or_err(argv[2], "strtos16 failed"));
    return EXIT_SUCCESS;
  } else if (argc == 3 && strcmp(argv[1], "--strtou16") == 0) {
    printf("'%s'-->%hu\n", argv[2], strtou16_or_err(argv[2], "strtou16 failed"));
    return EXIT_SUCCESS;

  } else if (argc == 4 && strcmp(argv[1], "--strchr-escaped") == 0) {
    printf("\"%s\" --> \"%s\"\n", argv[2], ul_strchr_escaped(argv[2], *argv[3]));
    return EXIT_SUCCESS;

  } else if (argc == 2 && strcmp(argv[1], "--next-string") == 0) {
    char *buf = "abc\0Y\0\0xyz\0X";
    char *end = buf + 12;
    char *p = buf;

    do {
      printf("str: '%s'\n", p);
    } while ((p = ul_next_string(p, end)));

    return EXIT_SUCCESS;

  } else if (argc == 3 && strcmp(argv[1], "--optstr") == 0) {

    size_t namesz, valsz;
    char *name = NULL, *val = NULL;
    char *p = argv[2];
    int rc;

    if (!ul_optstr_is_valid(p))
      errx(EXIT_FAILURE, _("unsupported option format: %s"), p);

    while ((rc = ul_optstr_next(&p, &name, &namesz, &val, &valsz)) == 0) {
      printf("'%.*s' : '%.*s'\n", (int) namesz, name,
               (int) valsz, val);
    }
    if (rc == 1)
      return EXIT_SUCCESS;
  } else {
    fprintf(stderr, "usage: %1$s --size <number>[suffix]\n"
        "       %1$s --parse-switch <str>\n"
        "       %1$s --cmp-paths <path> <path>\n"
        "       %1$s --strdup-member <str> <str>\n"
        "       %1$s --stralnumcmp <str> <str>\n"
        "       %1$s --cstrcasecmp <str> <str>\n"
        "       %1$s --normalize <str>\n"
        "       %1$s --strto{s,u}{16,32,64} <str>\n"
        "       %1$s --optstr <str>\n",
        argv[0]);
    exit(EXIT_FAILURE);
  }

  return EXIT_FAILURE;
}
#endif /* TEST_PROGRAM_STRUTILS */

Coverage Report

Created: 2025-07-11 06:18