ENVZ_ADD - phpMan

ENVZ_ADD(3)                                                        ENVZ_ADD(3)



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 ’=’ is considered to be  the
       value. If there is no ’=’, the value is taken to be NULL.  (While the value in case
       of a trailing ’=’ 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  (envz,envz_len)  and  returns  the
       entry if found, or NULL if not.

       envz_get()  looks for name in the envz vector (envz,envz_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 ’=’ 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.

EXAMPLE
       #include <stdio.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);
            return 0;
       }

NOTES
       These functions are a GNU extension. Handle with care.

SEE ALSO
       argz(3)



                                                                   ENVZ_ADD(3)

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