Originální popis anglicky:
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
Návod, kniha: Library Functions Manual
#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 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
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.
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.
Argz vectors without final NUL may lead to Segmentation Faults.
These functions are a GNU extension. Handle with care.
envz(3)
