argz_insert

ARGZ_ADD(3)							  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
       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 argu-
       ment 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)