NetBSD/usr.sbin/cron/env.c

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/* $NetBSD: env.c,v 1.10 1998/10/12 22:15:47 aidan Exp $ */
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/* Copyright 1988,1990,1993,1994 by Paul Vixie
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* 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 <paul@vix.com> uunet!decwrl!vixie!paul
*/
#include <sys/cdefs.h>
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#if !defined(lint) && !defined(LINT)
#if 0
static char rcsid[] = "Id: env.c,v 2.7 1994/01/26 02:25:50 vixie Exp";
#else
__RCSID("$NetBSD: env.c,v 1.10 1998/10/12 22:15:47 aidan Exp $");
#endif
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#endif
#include "cron.h"
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#include <string.h>
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char **
env_init()
{
char **p = (char **) malloc(sizeof(char **));
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p[0] = NULL;
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return (p);
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}
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void
env_free(envp)
char **envp;
{
char **p;
for (p = envp; *p; p++)
free(*p);
free(envp);
}
char **
env_copy(envp)
char **envp;
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{
int count, i;
char **p;
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for (count = 0; envp[count] != NULL; count++)
;
p = (char **) malloc((count+1) * sizeof(char *)); /* 1 for the NULL */
for (i = 0; i < count; i++)
p[i] = strdup(envp[i]);
p[count] = NULL;
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return (p);
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}
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char **
env_set(envp, envstr)
char **envp;
char *envstr;
{
int count, found;
char **p;
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/*
* 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;
}
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count++; /* for the NULL */
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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] = strdup(envstr);
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return (envp);
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}
/*
* 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((void *) envp,
(unsigned) ((count+1) * sizeof(char **)));
p[count] = p[count-1];
p[count-1] = strdup(envstr);
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return (p);
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}
/* return ERR = end of file
* FALSE = not an env setting (file was repositioned)
* TRUE = was an env setting
*/
int
load_env(envstr, f)
char *envstr;
FILE *f;
{
long filepos;
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int fileline, len;
char *name, *val, *s;
char *space = NULL;
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filepos = ftell(f);
fileline = LineNumber;
skip_comments(f);
if (EOF == get_string(envstr, MAX_ENVSTR, f, "\n"))
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return (ERR);
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Debug(DPARS, ("load_env, read <%s>\n", envstr))
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s = strchr(envstr, '=');
if (s && (*envstr != '"' || *envstr == '\'')) {
/*
* decide if this is an environment variable or not by
* checking for spaces in the middle of the variable name.
* (it could also be a crontab line of the form
* <min> <hour> <day> <month> <weekday> command flag=value)
*/
/* space before var name */
for (space = envstr; space < s && isspace(*space); space++)
;
/* var name */
for ( ; space < s && !isspace(*space); space++)
;
/* space after var name */
for ( ; space < s && isspace(*space); space++)
;
/*
* space should equal s.. otherwise, this is not an
* environment set command.
*/
} else if (s && (*envstr == '"' || *envstr == '\'')) {
/*
* allow quoting the environment variable name to contain
* spaces. The close quote will have to exist before the
* '=' character.
*/
space = strchr(envstr+1, *envstr);
if (!space || space > s) {
Debug(DPARS, ("load_env, didn't get valid string"));
fseek(f, filepos, 0);
Set_LineNum(fileline);
return (FALSE);
}
space++;
while (space < s && isspace(*space))
space++;
}
if (s != NULL && s != envstr && *space == '=') {
/* XXX:
* The manpage says spaces around the '=' are ignored, but
* there's no code here to ignore them.
*/
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*s++ = '\0';
val = s;
if (*envstr == '"' || *envstr == '\'') {
space = strchr(envstr+1, *envstr);
*space = 0;
name = strdup(envstr+1);
} else
name = strdup(envstr);
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} else {
Debug(DPARS, ("load_env, didn't get valid string"));
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fseek(f, filepos, 0);
Set_LineNum(fileline);
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return (FALSE);
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}
/*
* process value string
*/
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if (*val) {
len = strdtb(val);
if (len >= 2 && (val[0] == '\'' || val[0] == '"') &&
val[len-1] == val[0]) {
val[len-1] = '\0';
val++;
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}
}
(void) snprintf(envstr, MAX_ENVSTR, "%s=%s", name, val);
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Debug(DPARS, ("load_env, <%s> <%s> -> <%s>\n", name, val, envstr))
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free(name);
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return (TRUE);
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}
char *
env_get(name, envp)
char *name;
char **envp;
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{
int len = strlen(name);
char *p, *q;
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while ((p = *envp++) != NULL) {
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if (!(q = strchr(p, '=')))
continue;
if ((q - p) == len && !strncmp(p, name, len))
return (q+1);
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}
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return (NULL);
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}