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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | BUGS | SEE ALSO | COLOPHON |
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argz_add(3) Library Functions 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
Standard C library (libc, -lc)
#include <argz.h>
error_t argz_add(char **restrict argz, size_t *restrict argz_len,
const char *restrict str);
error_t argz_add_sep(char **restrict argz, size_t *restrict argz_len,
const char *restrict str, int delim);
error_t argz_append(char **restrict argz, size_t *restrict argz_len,
const char *restrict buf, size_t buf_len);
size_t argz_count(const char *argz, size_t argz_len);
error_t argz_create(char *const argv[], char **restrict argz,
size_t *restrict argz_len);
error_t argz_create_sep(const char *restrict str, int sep,
char **restrict argz, size_t *restrict argz_len);
void argz_delete(char **restrict argz, size_t *restrict argz_len,
char *restrict entry);
void argz_extract(const char *restrict argz, size_t argz_len,
char **restrict argv);
error_t argz_insert(char **restrict argz, size_t *restrict argz_len,
char *restrict before, const char *restrict entry);
char *argz_next(const char *restrict argz, size_t argz_len,
const char *restrict entry);
error_t argz_replace(char **restrict argz, size_t *restrict argz_len,
const char *restrict str, const char *restrict with,
unsigned int *restrict 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 through 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 (an integer type), and return 0 for success, and
ENOMEM if an allocation error occurs.
For an explanation of the terms used in this section, see
attributes(7).
┌─────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├─────────────────────────────────────┼───────────────┼─────────┤
│ argz_add(), argz_add_sep(), │ Thread safety │ MT-Safe │
│ argz_append(), argz_count(), │ │ │
│ argz_create(), argz_create_sep(), │ │ │
│ argz_delete(), argz_extract(), │ │ │
│ argz_insert(), argz_next(), │ │ │
│ argz_replace(), argz_stringify() │ │ │
└─────────────────────────────────────┴───────────────┴─────────┘
GNU.
Argz vectors without a terminating null byte may lead to
Segmentation Faults.
envz_add(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
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2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
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man-pages@man7.org
Linux man-pages 6.9.1 2024-06-15 argz_add(3)
Pages that refer to this page: envz_add(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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