argz_append man page on CentOS

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ARGZ_ADD(3)							   ARGZ_ADD(3)

NAME
       argz_add, argz_add_sep, argz_append, argz_count, argz_create, argz_cre‐
       ate_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  an
       array of strings, where the strings are separated by null bytes ('\0').
       If the length is non-zero, 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 point‐
       ers to the substrings, and a final NULL, making a Unix-style argv  vec‐
       tor.   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 null bytes ('\0')
       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 a terminating null byte may lead to Segmentation
       Faults.

CONFORMINT TO
       These functions are a GNU extension. Handle with care.

SEE ALSO
       envz(3)

								   ARGZ_ADD(3)
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