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authorUlrich Drepper <drepper@redhat.com>1998-09-15 21:24:37 +0000
committerUlrich Drepper <drepper@redhat.com>1998-09-15 21:24:37 +0000
commita8125d855218832508af812df585c5fac5093bc3 (patch)
treec5e474d75d6620f4e5df2c19a5d8e1aab1dd89c5 /posix/wordexp.c
parentaa2bc6a32d523af80d296aa9fe063b72ef99aa82 (diff)
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Update
1998-09-16 00:47 Tim Waugh <tim@cyberelk.demon.co.uk> * posix/wordexp-test.c: If expansion or substitution occurs anywhere in a word, the entire word is subject to field-splitting. * posix/wordexp.c (parse_glob): Look for end of word instead of end of field when deciding what to glob. (field_split_word): New function, now the only place where field-splitting is performed. (parse_dollars): New parameter - tell the caller if field-splitting should be performed on this word. * posix/wordexp-test.c (testit): Only call wordfree if wordexp succeeded (or failed with WRDE_NOSPACE). 1998-09-15 19:53 1998 Tim Waugh <tim@cyberelk.demon.co.uk> * posix/wordexp.c (wordexp): Don't convert IFS characters to blanks. * posix/wordexp-test.c: Words not the result of expansion or substitution should remain unchanged.
Diffstat (limited to 'posix/wordexp.c')
-rw-r--r--posix/wordexp.c348
1 files changed, 152 insertions, 196 deletions
diff --git a/posix/wordexp.c b/posix/wordexp.c
index 0139a99..e4bf414 100644
--- a/posix/wordexp.c
+++ b/posix/wordexp.c
@@ -56,7 +56,7 @@ extern char **__libc_argv;
static int parse_dollars (char **word, size_t *word_length, size_t *max_length,
const char *words, size_t *offset, int flags,
wordexp_t *pwordexp, const char *ifs,
- const char *ifs_white, int quoted)
+ const char *ifs_white, int quoted, int *fsplit)
internal_function;
static int parse_backtick (char **word, size_t *word_length,
size_t *max_length, const char *words,
@@ -183,6 +183,78 @@ no_space:
return WRDE_NOSPACE;
}
+static int
+internal_function
+field_split_word (char *word, wordexp_t *pwordexp, const char *ifs,
+ const char *ifs_white)
+{
+ size_t field_length;
+ size_t field_maxlen;
+ char *field = w_newword (&field_length, &field_maxlen);
+ char *field_begin = word;
+ int seen_nonws_ifs = 0;
+
+ if (!word)
+ return 0;
+
+ do
+ {
+ char *field_end = field_begin;
+ char *next_field;
+
+ /* If this isn't the first field, start a new word */
+ if (field_begin != word)
+ {
+ if (w_addword (pwordexp, field) == WRDE_NOSPACE)
+ goto no_space;
+
+ field = w_newword (&field_length, &field_maxlen);
+ }
+
+ /* Skip IFS whitespace before the field */
+ field_begin += strspn (field_begin, ifs_white);
+
+ if (!seen_nonws_ifs && *field_begin == 0)
+ /* Nothing but whitespace */
+ break;
+
+ /* Search for the end of the field */
+ field_end = field_begin + strcspn (field_begin, ifs);
+
+ /* Set up pointer to the character after end of field and
+ skip whitespace IFS after it. */
+ next_field = field_end + strspn (field_end, ifs_white);
+
+ /* Skip at most one non-whitespace IFS character after the field */
+ seen_nonws_ifs = 0;
+ if (*next_field && strchr (ifs, *next_field))
+ {
+ seen_nonws_ifs = 1;
+ next_field++;
+ }
+
+ /* Null-terminate it */
+ *field_end = 0;
+
+ /* Tag a copy onto the current word */
+ field = w_addstr (field, &field_length, &field_maxlen, field_begin);
+
+ if (field == NULL && *field_begin != '\0')
+ goto no_space;
+
+ field_begin = next_field;
+ }
+ while (seen_nonws_ifs || *field_begin);
+
+ if (field && w_addword (pwordexp, field))
+ goto no_space;
+
+ return 0;
+
+no_space:
+ return WRDE_NOSPACE;
+}
+
/* The parse_*() functions should leave *offset being the offset in 'words'
* to the last character processed.
*/
@@ -424,15 +496,15 @@ parse_glob (char **word, size_t *word_length, size_t *max_length,
int quoted = 0; /* 1 if singly-quoted, 2 if doubly */
int i;
wordexp_t glob_list; /* List of words to glob */
+ int fieldsplit = 0;
glob_list.we_wordc = 0;
glob_list.we_wordv = NULL;
glob_list.we_offs = 0;
for (; words[*offset] != '\0'; ++*offset)
{
- if ((ifs && strchr (ifs, words[*offset])) ||
- (!ifs && strchr (" \t\n", words[*offset])))
- /* Reached IFS */
+ if (strchr (" \t\n", words[*offset]))
+ /* Reached end of word */
break;
/* Sort out quoting */
@@ -468,7 +540,7 @@ parse_glob (char **word, size_t *word_length, size_t *max_length,
{
error = parse_dollars (word, word_length, max_length, words,
offset, flags, &glob_list, ifs, ifs_white,
- quoted == 2);
+ quoted == 2, &fieldsplit);
if (error)
goto tidy_up;
@@ -497,8 +569,16 @@ parse_glob (char **word, size_t *word_length, size_t *max_length,
/* Don't forget to re-parse the character we stopped at. */
--*offset;
+ if (fieldsplit)
+ {
+ error = field_split_word (*word, &glob_list, ifs, ifs_white);
+ if (*word)
+ free (*word);
+ }
+ else
+ error = w_addword (&glob_list, *word);
+
/* Glob the words */
- error = w_addword (&glob_list, *word);
*word = w_newword (word_length, max_length);
for (i = 0; error == 0 && i < glob_list.we_wordc; i++)
error = do_parse_glob (glob_list.we_wordv[i], word, word_length,
@@ -676,7 +756,8 @@ parse_arith (char **word, size_t *word_length, size_t *max_length,
{
case '$':
error = parse_dollars (&expr, &expr_length, &expr_maxlen,
- words, offset, flags, NULL, NULL, NULL, 1);
+ words, offset, flags, NULL, NULL, NULL, 1,
+ NULL);
/* The ``1'' here is to tell parse_dollars not to
* split the fields.
*/
@@ -871,100 +952,20 @@ exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length,
__close (fildes[1]);
buffer = __alloca (bufsize);
- if (!pwordexp)
- { /* Quoted - no field splitting */
-
- while (1)
- {
- if ((buflen = __read (fildes[0], buffer, bufsize)) < 1)
- {
- if (__waitpid (pid, NULL, WNOHANG) == 0)
- continue;
- if ((buflen = __read (fildes[0], buffer, bufsize)) < 1)
- break;
- }
-
- *word = w_addmem (*word, word_length, max_length, buffer, buflen);
- if (*word == NULL)
- goto no_space;
- }
- }
- else
- /* Not quoted - split fields */
+ /* Read fildes[0] and put it into a word. */
+ while (1)
{
- int copying = 0;
- /* 'copying' is:
- * 0 when searching for first character in a field not IFS white space
- * 1 when copying the text of a field
- * 2 when searching for possible non-whitespace IFS
- */
-
- while (1)
+ if ((buflen = __read (fildes[0], buffer, bufsize)) < 1)
{
+ if (__waitpid (pid, NULL, WNOHANG) == 0)
+ continue;
if ((buflen = __read (fildes[0], buffer, bufsize)) < 1)
- {
- if (__waitpid (pid, NULL, WNOHANG) == 0)
- continue;
- if ((__read (fildes[0], buffer, bufsize)) < 1)
- break;
- }
-
- for (i = 0; i < buflen; ++i)
- {
- if (strchr (ifs, buffer[i]) != NULL)
- {
- /* Current character is IFS */
- if (strchr (ifs_white, buffer[i]) == NULL)
- {
- /* Current character is IFS but not whitespace */
- if (copying == 2)
- {
- /* current character
- * |
- * V
- * eg: text<space><comma><space>moretext
- *
- * So, strip whitespace IFS (like at the start)
- */
- copying = 0;
- continue;
- }
-
- copying = 0;
- /* fall through and delimit field.. */
- }
- else
- {
- /* Current character is IFS white space */
-
- /* If not copying a field, ignore it */
- if (copying != 1)
- continue;
-
- /* End of field (search for non-ws IFS afterwards) */
- copying = 2;
- }
-
- /* First IFS white space, or IFS non-whitespace.
- * Delimit the field. Nulls are converted by w_addword. */
- if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
- goto no_space;
-
- *word = w_newword (word_length, max_length);
- /* fall back round the loop.. */
- }
- else
- {
- /* Not IFS character */
- copying = 1;
-
- *word = w_addchar (*word, word_length, max_length,
- buffer[i]);
- if (*word == NULL)
- goto no_space;
- }
- }
+ break;
}
+
+ *word = w_addmem (*word, word_length, max_length, buffer, buflen);
+ if (*word == NULL)
+ goto no_space;
}
/* Bash chops off trailing newlines, which seems sensible. */
@@ -1701,87 +1702,11 @@ envsubst:
if (value == NULL)
return 0;
- if (quoted || !pwordexp)
- {
- /* Quoted - no field split */
- *word = w_addstr (*word, word_length, max_length, value);
- if (free_value)
- free (value);
-
- return *word ? 0 : WRDE_NOSPACE;
- }
- else
- {
- /* Need to field-split */
- char *value_copy = __strdup (value); /* Don't modify value */
- char *field_begin = value_copy;
- int seen_nonws_ifs = 0;
-
- if (free_value)
- free (value);
-
- if (value_copy == NULL)
- goto no_space;
-
- do
- {
- char *field_end = field_begin;
- char *next_field;
-
- /* If this isn't the first field, start a new word */
- if (field_begin != value_copy)
- {
- if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
- {
- free (value_copy);
- goto no_space;
- }
-
- *word = w_newword (word_length, max_length);
- }
-
- /* Skip IFS whitespace before the field */
- field_begin += strspn (field_begin, ifs_white);
-
- if (!seen_nonws_ifs && *field_begin == 0)
- /* Nothing but whitespace */
- break;
-
- /* Search for the end of the field */
- field_end = field_begin + strcspn (field_begin, ifs);
-
- /* Set up pointer to the character after end of field and
- skip whitespace IFS after it. */
- next_field = field_end + strspn (field_end, ifs_white);
-
- /* Skip at most one non-whitespace IFS character after the field */
- seen_nonws_ifs = 0;
- if (*next_field && strchr (ifs, *next_field))
- {
- seen_nonws_ifs = 1;
- next_field++;
- }
-
- /* Null-terminate it */
- *field_end = 0;
+ *word = w_addstr (*word, word_length, max_length, value);
+ if (free_value)
+ free (value);
- /* Tag a copy onto the current word */
- *word = w_addstr (*word, word_length, max_length, field_begin);
-
- if (*word == NULL && *field_begin != '\0')
- {
- free (value_copy);
- goto no_space;
- }
-
- field_begin = next_field;
- }
- while (seen_nonws_ifs || *field_begin);
-
- free (value_copy);
- }
-
- return 0;
+ return *word ? 0 : WRDE_NOSPACE;
success:
error = 0;
@@ -1809,7 +1734,7 @@ internal_function
parse_dollars (char **word, size_t *word_length, size_t *max_length,
const char *words, size_t *offset, int flags,
wordexp_t *pwordexp, const char *ifs, const char *ifs_white,
- int quoted)
+ int quoted, int *fsplit)
{
/* We are poised _at_ "$" */
switch (words[1 + *offset])
@@ -1839,6 +1764,12 @@ parse_dollars (char **word, size_t *word_length, size_t *max_length,
if (words[i] == ')' && words[i + 1] == ')')
{
(*offset) += 3;
+
+ /* This word is subject to field-splitting as long as
+ * it isn't quoted. */
+ if (fsplit)
+ *fsplit = !quoted;
+
/* Call parse_arith -- 0 is for "no brackets" */
return parse_arith (word, word_length, max_length, words, offset,
flags, 0);
@@ -1849,11 +1780,23 @@ parse_dollars (char **word, size_t *word_length, size_t *max_length,
return WRDE_CMDSUB;
(*offset) += 2;
+
+ /* This word is subject to field-splitting as long as
+ * it isn't quoted. */
+ if (fsplit)
+ *fsplit = !quoted;
+
return parse_comm (word, word_length, max_length, words, offset, flags,
quoted? NULL : pwordexp, ifs, ifs_white);
case '[':
(*offset) += 2;
+
+ /* This word is subject to field-splitting as long as
+ * it isn't quoted. */
+ if (fsplit)
+ *fsplit = !quoted;
+
/* Call parse_arith -- 1 is for "brackets" */
return parse_arith (word, word_length, max_length, words, offset, flags,
1);
@@ -1861,6 +1804,12 @@ parse_dollars (char **word, size_t *word_length, size_t *max_length,
case '{':
default:
++(*offset); /* parse_param needs to know if "{" is there */
+
+ /* This word is subject to field-splitting as long as
+ * it isn't quoted. */
+ if (fsplit)
+ *fsplit = !quoted;
+
return parse_param (word, word_length, max_length, words, offset, flags,
pwordexp, ifs, ifs_white, quoted);
}
@@ -1948,7 +1897,7 @@ parse_dquote (char **word, size_t *word_length, size_t *max_length,
case '$':
error = parse_dollars (word, word_length, max_length, words, offset,
- flags, pwordexp, ifs, ifs_white, 1);
+ flags, pwordexp, ifs, ifs_white, 1, NULL);
/* The ``1'' here is to tell parse_dollars not to
* split the fields. It may need to, however ("$@").
*/
@@ -2030,6 +1979,7 @@ wordexp (const char *words, wordexp_t *pwordexp, int flags)
char ifs_white[4];
char **old_wordv = pwordexp->we_wordv;
size_t old_wordc = (flags & WRDE_REUSE) ? pwordexp->we_wordc : 0;
+ int fieldsplit_this_word = 0;
if (flags & WRDE_REUSE)
{
@@ -2100,7 +2050,8 @@ wordexp (const char *words, wordexp_t *pwordexp, int flags)
*whch = '\0';
}
- for (words_offset = 0 ; words[words_offset] ; ++words_offset)
+ fieldsplit_this_word = 0;
+ for (words_offset = 0 ; ; ++words_offset)
switch (words[words_offset])
{
case '\\':
@@ -2115,7 +2066,7 @@ wordexp (const char *words, wordexp_t *pwordexp, int flags)
case '$':
error = parse_dollars (&word, &word_length, &max_length, words,
&words_offset, flags, pwordexp, ifs, ifs_white,
- 0);
+ 0, &fieldsplit_this_word);
if (error)
goto do_error;
@@ -2137,6 +2088,8 @@ wordexp (const char *words, wordexp_t *pwordexp, int flags)
if (error)
goto do_error;
+ fieldsplit_this_word = 1;
+
break;
case '"':
@@ -2181,7 +2134,8 @@ wordexp (const char *words, wordexp_t *pwordexp, int flags)
default:
/* Is it a word separator? */
- if (strchr (" \t", words[words_offset]) == NULL)
+ if (words[words_offset] != '\0' &&
+ strchr (" \t", words[words_offset]) == NULL)
{
char ch = words[words_offset];
@@ -2196,11 +2150,6 @@ wordexp (const char *words, wordexp_t *pwordexp, int flags)
}
/* "Ordinary" character -- add it to word */
-
- /* Convert IFS chars to blanks -- bash does this */
- if (strchr (ifs, ch))
- ch = ' ';
-
word = w_addchar (word, &word_length, &max_length,
ch);
if (word == NULL)
@@ -2215,22 +2164,29 @@ wordexp (const char *words, wordexp_t *pwordexp, int flags)
/* If a word has been delimited, add it to the list. */
if (word != NULL)
{
- error = w_addword (pwordexp, word);
+ if (fieldsplit_this_word)
+ {
+ error = field_split_word (word, pwordexp, ifs, ifs_white);
+ free (word);
+ }
+ else
+ error = w_addword (pwordexp, word);
+
if (error)
goto do_error;
}
- word = w_newword (&word_length, &max_length);
- }
+ fieldsplit_this_word = 0;
- /* End of string */
+ if (words[words_offset] == '\0')
+ /* End of string. */
+ goto end_of_string;
- /* There was a word separator at the end */
- if (word == NULL) /* i.e. w_newword */
- return 0;
+ word = w_newword (&word_length, &max_length);
+ }
- /* There was no field separator at the end */
- return w_addword (pwordexp, word);
+end_of_string:
+ return 0;
do_error:
/* Error: