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ARGZ_ADD(3) Linux Programmer's Manual ARGZ_ADD(3)


     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


     #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);
     void argz_delete(char **argz, size_t *argz_len, char *entry);
     void argz_extract(const 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(const 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
     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  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.


     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


     For   an   explanation   of   the  terms  used  in  this  section,  see
     allbox; lbw33 lb lb l l l.   Interface Attribute Value  T{  argz_add(),
     argz_append(), argz_count(),
     argz_create(), argz_create_sep(),
     argz_delete(), argz_extract(),
     argz_insert(), argz_next(),
     argz_replace(), argz_stringify() T}   Thread safety  MT-Safe


     These functions are a GNU extension.  Handle with care.


     Argz  vectors  without a terminating null byte may lead to Segmentation




     This page is part of release 4.16 of the Linux  man-pages  project.   A
     description  of  the project, information about reporting bugs, and the
     latest    version    of    this    page,    can     be     found     at
                                2017-09-15                       ARGZ_ADD(3)
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