| NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | CONFORMING TO | BUGS | SEE ALSO | COLOPHON | The Linux Programming Interface |
ARGZ_ADD(3) Linux Programmer's Manual ARGZ_ADD(3)
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
#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);
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 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.
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.
These functions are a GNU extension. Handle with care.
Argz vectors without a terminating null byte may lead to Segmentation Faults.
envz_add(3)
This page is part of release 3.32 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
2007-05-18 ARGZ_ADD(3)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface