NAME

       argz_add,    argz_add_sep,    argz_append,   argz_count,   argz_create,   argz_create_sep,
       argz_delete,  argz_extract,  argz_insert,  argz_next,   argz_replace,   argz_stringify   -
       functions to handle an argz list

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <argz.h>

       error_t argz_add(char **restrict argz, size_t *restrict argz_len,
                       const char *restrict str);

       error_t argz_add_sep(char **restrict argz, size_t *restrict argz_len,
                       const char *restrict str, int delim);

       error_t argz_append(char **restrict argz, size_t *restrict argz_len,
                       const char *restrict buf, size_t buf_len);

       size_t argz_count(const char *argz, size_t argz_len);

       error_t argz_create(char *const argv[], char **restrict argz,
                       size_t *restrict argz_len);

       error_t argz_create_sep(const char *restrict str, int sep,
                       char **restrict argz, size_t *restrict argz_len);

       void argz_delete(char **restrict argz, size_t *restrict argz_len,
                       char *restrict entry);

       void argz_extract(const char *restrict argz, size_t argz_len,
                       char **restrict argv);

       error_t argz_insert(char **restrict argz, size_t *restrict argz_len,
                       char *restrict before, const char *restrict entry);

       char *argz_next(const char *restrict argz, size_t argz_len,
                       const char *restrict entry);

       error_t argz_replace(char **restrict argz, size_t *restrict argz_len,
                       const char *restrict str, const char *restrict with,
                       unsigned int *restrict replace_count);

       void argz_stringify(char *argz, size_t len, int sep);

DESCRIPTION

       These functions are glibc-specific.

       An  argz  vector  is a pointer to a character buffer together with a length.  The intended
       interpretation of the character buffer is an array  of  strings,  where  the  strings  are
       separated  by  null  bytes  ('\0').  If the length is nonzero, the last byte of the buffer
       must be a null byte.

       These functions are for handling argz vectors.  The pair (NULL,0) is an argz vector,  and,
       conversely,  argz vectors of length 0 must have null pointer.  Allocation of nonempty argz
       vectors is done using malloc(3), so that free(3) can be used to dispose of them again.

       argz_add() adds the string str at the end of  the  array  *argz,  and  updates  *argz  and
       *argz_len.

       argz_add_sep()  is  similar,  but  splits  the string str into substrings separated by the
       delimiter delim.  For example, one might use this on a UNIX  search  path  with  delimiter
       ':'.

       argz_append()  appends the argz vector (buf, buf_len) after (*argz, *argz_len) and updates
       *argz and *argz_len.  (Thus, *argz_len will be increased by buf_len.)

       argz_count() counts the number of strings, that is, the number of null  bytes  ('\0'),  in
       (argz, argz_len).

       argz_create()  converts  a UNIX-style argument vector argv, terminated by (char *) 0, into
       an argz vector (*argz, *argz_len).

       argz_create_sep()  converts  the  null-terminated  string  str   into   an   argz   vector
       (*argz, *argz_len) by breaking it up at every occurrence of the separator sep.

       argz_delete()   removes   the   substring  pointed  to  by  entry  from  the  argz  vector
       (*argz, *argz_len) and updates *argz and *argz_len.

       argz_extract()  is  the  opposite  of   argz_create().    It   takes   the   argz   vector
       (argz, argz_len) and fills the array starting at argv with pointers to the substrings, and
       a final NULL, making a UNIX-style  argv  vector.   The  array  argv  must  have  room  for
       argz_count(argz, argz_len) + 1 pointers.

       argz_insert() is the opposite of argz_delete().  It inserts the argument entry at position
       before into the argz vector (*argz, *argz_len) and updates *argz and *argz_len.  If before
       is NULL, then entry will inserted at the end.

       argz_next()  is  a  function to step through the argz vector.  If entry is NULL, the first
       entry is returned.  Otherwise, the entry following is returned.  It returns NULL if  there
       is no following entry.

       argz_replace()  replaces each occurrence of str with with, reallocating argz as necessary.
       If replace_count is  non-NULL,  *replace_count  will  be  incremented  by  the  number  of
       replacements.

       argz_stringify() is the opposite of argz_create_sep().  It transforms the argz vector into
       a normal string by replacing all null bytes ('\0') except the last by sep.

RETURN VALUE

       All argz functions that do memory allocation have a return type  of  error_t  (an  integer
       type), and return 0 for success, and ENOMEM if an allocation error occurs.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       ┌───────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                      │ Attribute     │ Value   │
       ├───────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │argz_add(), argz_add_sep(), argz_append(), argz_count(),       │ Thread safety │ MT-Safe │
       │argz_create(), argz_create_sep(), argz_delete(),               │               │         │
       │argz_extract(), argz_insert(), argz_next(), argz_replace(),    │               │         │
       │argz_stringify()                                               │               │         │
       └───────────────────────────────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       These functions are a GNU extension.

BUGS

       Argz vectors without a terminating null byte may lead to Segmentation Faults.

SEE ALSO

       envz_add(3)