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envz_add (3)
  • envz_add (3) ( Русские man: Библиотечные вызовы )
  • >> envz_add (3) ( Linux man: Библиотечные вызовы )
  •  

    NAME

    envz_add, envz_entry, envz_get, envz_merge,
    envz_remove, envz_strip - environment string support
     
    

    SYNOPSIS

    #include <envz.h>
    
    error_t envz_add(char **envz, size_t *envz_len,
    
                        const char *name, const char *value); char *envz_entry(const char *envz, size_t *envz_len, const char *name); char *envz_get(const char *envz, size_t *envz_len, const char *name); error_t envz_merge(char **envz, size_t *envz_len,
                        const char *envz2, size_t envz2_len, int override); void envz_remove(char **envz, size_t *envz_len, const char *name); void envz_strip(char **envz, size_t *envz_len);
     

    DESCRIPTION

    These functions are glibc-specific.

    An argz vector is a pointer to a character buffer together with a length, see argz_add(3). An envz vector is a special argz vector, namely one where the strings have the form "name=value". Everything after the first aq=aq is considered to be the value. If there is no aq=aq, the value is taken to be NULL. (While the value in case of a trailing aq=aq is the empty string "".)

    These functions are for handling envz vectors.

    envz_add() adds the string name = value (in case value is non-NULL) or name (in case value is NULL) to the envz vector (*envz*envz_len) and updates *envz and *envz_len. If an entry with the same name existed, it is removed.

    envz_entry() looks for name in the envz vector (envzenvz_len) and returns the entry if found, or NULL if not.

    envz_get() looks for name in the envz vector (envzenvz_len) and returns the value if found, or NULL if not. (Note that the value can also be NULL, namely when there is an entry for name without aq=aq sign.)

    envz_merge() adds each entry in envz2 to *envz, as if with envz_add(). If override is true, then values in envz2 will supersede those with the same name in *envz, otherwise not.

    envz_remove() removes the entry for name from (*envz*envz_len) if there was one.

    envz_strip() removes all entries with value NULL.  

    RETURN VALUE

    All envz functions that do memory allocation have a return type of error_t, and return 0 for success, and ENOMEM if an allocation error occurs.  

    CONFORMING TO

    These functions are a GNU extension. Handle with care.  

    EXAMPLE

    #include <stdio.h>
    #include <stdlib.h>
    #include <envz.h>
    
    int
    main(int argc, char *argv[], char *envp[])
    {
        int i, e_len = 0;
        char *str;
    
        for (i=0; envp[i] != NULL; i++)
            e_len += strlen(envp[i]) + 1;
    
        str = envz_entry(*envp, e_len, "HOME");
        printf("%s\n", str);
        str = envz_get(*envp, e_len, "HOME");
        printf("%s\n", str);
        exit(EXIT_SUCCESS);
    }
    
     

    SEE ALSO

    argz_add(3)  

    COLOPHON

    This page is part of release 3.14 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/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    CONFORMING TO
    EXAMPLE
    SEE ALSO
    COLOPHON


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