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Fix a bug where the value of ${SOMEVAR} would simply disappear if there

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was a separator character immediately before it.  This wasn't likely to
happen in #-lines, but we might as well get it right.  Also fix it so
that "" and "" will create a zero-length argument.

Approved by:	re (blanket `env')
This commit is contained in:
Garance A Drosehn 2005-06-21 21:37:53 +00:00
parent b0d9aedd28
commit 530aafd4d0
1 changed files with 48 additions and 23 deletions
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71
usr.bin/env/envopts.c vendored
View File

@ -43,8 +43,9 @@ __FBSDID("$FreeBSD$");
#include "envopts.h"
static void expand_vars(char **thisarg_p, char **dest_p, const char
**src_p);
static const char *
expand_vars(char **thisarg_p, char **dest_p, const char
**src_p);
static int is_there(char *candidate);
/*
@ -161,7 +162,8 @@ search_paths(char *path, char **argv)
void
split_spaces(const char *str, int *origind, int *origc, char ***origv)
{
const char *bq_src, *src;
static const char *nullarg = "";
const char *bq_src, *copystr, *src;
char *dest, **newargv, *newstr, **nextarg, **oldarg;
int addcount, bq_destlen, copychar, found_sep, in_arg, in_dq, in_sq;
@ -190,7 +192,14 @@ split_spaces(const char *str, int *origind, int *origc, char ***origv)
bq_destlen = in_arg = in_dq = in_sq = 0;
bq_src = NULL;
for (src = str, dest = newstr; *src != '\0'; src++) {
/*
* This switch will look at a character in *src, and decide
* what should be copied to *dest. It only decides what
* character(s) to copy, it should not modify *dest. In some
* cases, it will look at multiple characters from *src.
*/
copychar = found_sep = 0;
copystr = NULL;
switch (*src) {
case '"':
if (in_sq)
@ -198,6 +207,12 @@ split_spaces(const char *str, int *origind, int *origc, char ***origv)
else if (in_dq)
in_dq = 0;
else {
/*
* Referencing nullarg ensures that a new
* argument is created, even if this quoted
* string ends up with zero characters.
*/
copystr = nullarg;
in_dq = 1;
bq_destlen = dest - *(nextarg - 1);
bq_src = src;
@ -207,7 +222,8 @@ split_spaces(const char *str, int *origind, int *origc, char ***origv)
if (in_sq)
copychar = *src;
else {
expand_vars((nextarg - 1), &dest, &src);
copystr = expand_vars((nextarg - 1), &dest,
&src);
}
break;
case '\'':
@ -216,6 +232,12 @@ split_spaces(const char *str, int *origind, int *origc, char ***origv)
else if (in_sq)
in_sq = 0;
else {
/*
* Referencing nullarg ensures that a new
* argument is created, even if this quoted
* string ends up with zero characters.
*/
copystr = nullarg;
in_sq = 1;
bq_destlen = dest - *(nextarg - 1);
bq_src = src;
@ -305,14 +327,22 @@ split_spaces(const char *str, int *origind, int *origc, char ***origv)
copychar = *src;
}
}
if (copychar) {
/*
* Now that the switch has determined what (if anything)
* needs to be copied, copy whatever that is to *dest.
*/
if (copychar || copystr != NULL) {
if (!in_arg) {
/* This is the first byte of a new argument */
*nextarg++ = dest;
addcount++;
in_arg = 1;
}
*dest++ = (char)copychar;
if (copychar)
*dest++ = (char)copychar;
else if (copystr != NULL)
while (*copystr != '\0')
*dest++ = *copystr++;
} else if (found_sep) {
*dest++ = '\0';
while (isspacech(*src))
@ -355,11 +385,11 @@ split_spaces(const char *str, int *origind, int *origc, char ***origv)
* at the initial '$', and if successful it will update *src_p, *dest_p, and
* possibly *thisarg_p in the calling routine.
*/
void
static const char *
expand_vars(char **thisarg_p, char **dest_p, const char **src_p)
{
const char *vbegin, *vend, *vvalue;
char *edest, *newstr, *vname;
char *newstr, *vname;
int bad_reference;
size_t namelen, newlen;
@ -393,7 +423,7 @@ expand_vars(char **thisarg_p, char **dest_p, const char **src_p)
fprintf(stderr,
"#env replacing ${%s} with null string\n",
vname);
return;
return (NULL);
}
if (env_verbosity > 2)
@ -402,29 +432,24 @@ expand_vars(char **thisarg_p, char **dest_p, const char **src_p)
/*
* There is some value to copy to the destination. If the value is
* shorter than the ${VARNAME} reference that it replaces, then we
* can just copy the value to the existing destination.
* shorter than the ${VARNAME} reference that it replaces, then our
* caller can just copy the value to the existing destination.
*/
edest = *dest_p;
if (strlen(vname) + 3 >= strlen(vvalue)) {
while (*vvalue != '\0')
*edest++ = *vvalue++;
*dest_p = edest;
return;
}
if (strlen(vname) + 3 >= strlen(vvalue))
return (vvalue);
/*
* The value is longer than the string it replaces, which means the
* present destination area is too small to hold it. Create a new
* destination area, copy the present 'thisarg' value and the value
* of the referenced-variable to it, and then update the caller's
* 'thisarg' and 'dest' variables to match.
* destination area, copy the present 'thisarg' value to it, and
* update the caller's 'thisarg' and 'dest' variables to match.
* Note that it is still the caller which will copy vvalue to *dest.
*/
*edest = '\0'; /* Provide terminator for 'thisarg' */
**dest_p = '\0'; /* Provide terminator for 'thisarg' */
newlen = strlen(*thisarg_p) + strlen(vvalue) + strlen(*src_p) + 1;
newstr = malloc(newlen);
strcpy(newstr, *thisarg_p);
strcat(newstr, vvalue);
*thisarg_p = newstr;
*dest_p = strchr(newstr, '\0');
return (vvalue);
}