ARGZ_ADD(3)						     Library Functions Manual						       ARGZ_ADD(3)

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

SYNOPSIS

       #include <argz.h>

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

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

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

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

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

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

       error_t
       argz_delete(char **argz, size_t *argz_len, char *entry);

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

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

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

       error_t
       argz_replace(char **argz, size_t *argz_len, const char *str,
		    const char *with, unsigned int *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 array	of
       strings, where the strings are separated by NUL bytes.  If the length is nonzero, the last byte of the buffer must be a NUL.

       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 NUL bytes, 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 NUL-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 point-
       ers 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 trough 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 NULs except the
       last by sep.

RETURN VALUE

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

BUGS

       Argz vectors without final NUL may lead to Segmentation Faults.

NOTES

       These functions are a GNU extension. Handle with care.

SEE ALSO

       envz(3)

																       ARGZ_ADD(3)