386BSD 0.1 development

[unix-history] / usr / src / libexec / crond / env.c

#if !defined(lint) && !defined(LINT)
static char rcsid[] = "$Header: env.c,v 2.2 90/07/18 00:23:48 vixie Exp $";
#endif

/* Copyright 1988,1990 by Paul Vixie
* All rights reserved
*
* Distribute freely, except: don't remove my name from the source or
* documentation (don't take credit for my work), mark your changes (don't
* get me blamed for your possible bugs), don't alter or remove this
* notice.  May be sold if buildable source is provided to buyer.  No
* warrantee of any kind, express or implied, is included with this
* software; use at your own risk, responsibility for damages (if any) to
* anyone resulting from the use of this software rests entirely with the
* user.
*
* Send bug reports, bug fixes, enhancements, requests, flames, etc., and
* I'll try to keep a version up to date.  I can be reached as follows:
* Paul Vixie, 329 Noe Street, San Francisco, CA, 94114, (415) 864-7013,
* paul@vixie.sf.ca.us || {hoptoad,pacbell,decwrl,crash}!vixie!paul
*/


#include "cron.h"


char **
env_init()
{
       extern char     *malloc();
       register char   **p = (char **) malloc(sizeof(char **));

       p[0] = NULL;
       return p;
}


char **
env_set(envp, envstr)
       char    **envp;
       char    *envstr;
{
       extern char     *realloc(), *savestr();
       register int    count, found;
       register char   **p;

       /*
        * count the number of elements, including the null pointer;
        * also set 'found' to -1 or index of entry if already in here.
        */
       found = -1;
       for (count = 0;  envp[count] != NULL;  count++)
       {
               if (!strcmp_until(envp[count], envstr, '='))
                       found = count;
       }
       count++;                /* for the null pointer
                                */

       if (found != -1)
       {
               /*
                * it exists already, so just free the existing setting,
                * save our new one there, and return the existing array.
                */
               free(envp[found]);
               envp[found] = savestr(envstr);
               return envp;
       }

       /*
        * it doesn't exist yet, so resize the array, move null pointer over
        * one, save our string over the old null pointer, and return resized
        * array.
        */
       p = (char **) realloc(
                       (char *)   envp,
                       (unsigned) ((count+1) * sizeof(char **))
       );
       p[count] = p[count-1];
       p[count-1] = savestr(envstr);
       return p;
}


int
load_env(envstr, f)
       char    *envstr;
       FILE    *f;
{
       /* return       ERR = end of file
        *              FALSE = not an env setting (file was repositioned)
        *              TRUE = was an env setting
        */
       char    *strcpy(), *sprintf();
       long    filepos;
       int     fileline;
       char    name[MAX_TEMPSTR], val[MAX_ENVSTR];
       int     fields, strdtb();
       void    skip_comments();

       filepos = ftell(f);
       fileline = LineNumber;
       skip_comments(f);
       if (EOF == get_string(envstr, MAX_ENVSTR, f, "\n"))
               return ERR;

       Debug(DPARS, ("load_env, read <%s>\n", envstr))

       name[0] = val[0] = '\0';
       fields = sscanf(envstr, "%[^ =] = %[^\n#]", name, val);
       if (fields != 2)
       {
               Debug(DPARS, ("load_env, not 2 fields (%d)\n", fields))
               fseek(f, filepos, 0);
               Set_LineNum(fileline);
               return FALSE;
       }

       /* 2 fields from scanf; looks like an env setting
        */

       /*
        * process value string
        */
       {
               int     len = strdtb(val);

               if (len >= 2)
                       if (val[0] == '\'' || val[0] == '"')
                               if (val[len-1] == val[0])
                               {
                                       val[len-1] = '\0';
                                       (void) strcpy(val, val+1);
                               }
       }

       (void) sprintf(envstr, "%s=%s", name, val);
       Debug(DPARS, ("load_env, <%s> <%s> -> <%s>\n", name, val, envstr))
       return TRUE;
}


char *
env_get(name, envp)
       char    *name;
       char    **envp;
{
       char    *index();

       for (;  *envp;  envp++)
               if (!strcmp_until(*envp, name, '='))
                       return index(*envp, '=') + 1;
       return NULL;
}