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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 06:17:24 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 06:17:24 +0000
commit9d8085074991d5c0a42d6fc96a2d1a3ee918aad1 (patch)
treec85bca1e6c11eb872edfc64c524d20f2b7e3307b /array.c
parentInitial commit. (diff)
downloadbash-9d8085074991d5c0a42d6fc96a2d1a3ee918aad1.tar.xz
bash-9d8085074991d5c0a42d6fc96a2d1a3ee918aad1.zip
Adding upstream version 5.1.upstream/5.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'array.c')
-rw-r--r--array.c1236
1 files changed, 1236 insertions, 0 deletions
diff --git a/array.c b/array.c
new file mode 100644
index 0000000..6d3554b
--- /dev/null
+++ b/array.c
@@ -0,0 +1,1236 @@
+/*
+ * array.c - functions to create, destroy, access, and manipulate arrays
+ * of strings.
+ *
+ * Arrays are sparse doubly-linked lists. An element's index is stored
+ * with it.
+ *
+ * Chet Ramey
+ * chet@ins.cwru.edu
+ */
+
+/* Copyright (C) 1997-2020 Free Software Foundation, Inc.
+
+ This file is part of GNU Bash, the Bourne Again SHell.
+
+ Bash is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Bash is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "config.h"
+
+#if defined (ARRAY_VARS)
+
+#if defined (HAVE_UNISTD_H)
+# ifdef _MINIX
+# include <sys/types.h>
+# endif
+# include <unistd.h>
+#endif
+
+#include <stdio.h>
+#include "bashansi.h"
+
+#include "shell.h"
+#include "array.h"
+#include "builtins/common.h"
+
+#define ADD_BEFORE(ae, new) \
+ do { \
+ ae->prev->next = new; \
+ new->prev = ae->prev; \
+ ae->prev = new; \
+ new->next = ae; \
+ } while(0)
+
+#define ADD_AFTER(ae, new) \
+ do { \
+ ae->next->prev = new; \
+ new->next = ae->next; \
+ new->prev = ae; \
+ ae->next = new; \
+ } while (0)
+
+static char *array_to_string_internal PARAMS((ARRAY_ELEMENT *, ARRAY_ELEMENT *, char *, int));
+
+static char *spacesep = " ";
+
+#define IS_LASTREF(a) (a->lastref)
+
+#define LASTREF_START(a, i) \
+ (IS_LASTREF(a) && i >= element_index(a->lastref)) ? a->lastref \
+ : element_forw(a->head)
+
+#define LASTREF(a) (a->lastref ? a->lastref : element_forw(a->head))
+
+#define INVALIDATE_LASTREF(a) a->lastref = 0
+#define SET_LASTREF(a, e) a->lastref = (e)
+#define UNSET_LASTREF(a) a->lastref = 0;
+
+ARRAY *
+array_create()
+{
+ ARRAY *r;
+ ARRAY_ELEMENT *head;
+
+ r = (ARRAY *)xmalloc(sizeof(ARRAY));
+ r->type = array_indexed;
+ r->max_index = -1;
+ r->num_elements = 0;
+ r->lastref = (ARRAY_ELEMENT *)0;
+ head = array_create_element(-1, (char *)NULL); /* dummy head */
+ head->prev = head->next = head;
+ r->head = head;
+ return(r);
+}
+
+void
+array_flush (a)
+ARRAY *a;
+{
+ register ARRAY_ELEMENT *r, *r1;
+
+ if (a == 0)
+ return;
+ for (r = element_forw(a->head); r != a->head; ) {
+ r1 = element_forw(r);
+ array_dispose_element(r);
+ r = r1;
+ }
+ a->head->next = a->head->prev = a->head;
+ a->max_index = -1;
+ a->num_elements = 0;
+ INVALIDATE_LASTREF(a);
+}
+
+void
+array_dispose(a)
+ARRAY *a;
+{
+ if (a == 0)
+ return;
+ array_flush (a);
+ array_dispose_element(a->head);
+ free(a);
+}
+
+ARRAY *
+array_copy(a)
+ARRAY *a;
+{
+ ARRAY *a1;
+ ARRAY_ELEMENT *ae, *new;
+
+ if (a == 0)
+ return((ARRAY *) NULL);
+ a1 = array_create();
+ a1->type = a->type;
+ a1->max_index = a->max_index;
+ a1->num_elements = a->num_elements;
+ for (ae = element_forw(a->head); ae != a->head; ae = element_forw(ae)) {
+ new = array_create_element(element_index(ae), element_value(ae));
+ ADD_BEFORE(a1->head, new);
+ if (ae == LASTREF(a))
+ SET_LASTREF(a1, new);
+ }
+ return(a1);
+}
+
+/*
+ * Make and return a new array composed of the elements in array A from
+ * S to E, inclusive.
+ */
+ARRAY *
+array_slice(array, s, e)
+ARRAY *array;
+ARRAY_ELEMENT *s, *e;
+{
+ ARRAY *a;
+ ARRAY_ELEMENT *p, *n;
+ int i;
+ arrayind_t mi;
+
+ a = array_create ();
+ a->type = array->type;
+
+ for (mi = 0, p = s, i = 0; p != e; p = element_forw(p), i++) {
+ n = array_create_element (element_index(p), element_value(p));
+ ADD_BEFORE(a->head, n);
+ mi = element_index(n);
+ }
+ a->num_elements = i;
+ a->max_index = mi;
+ return a;
+}
+
+/*
+ * Walk the array, calling FUNC once for each element, with the array
+ * element as the argument.
+ */
+void
+array_walk(a, func, udata)
+ARRAY *a;
+sh_ae_map_func_t *func;
+void *udata;
+{
+ register ARRAY_ELEMENT *ae;
+
+ if (a == 0 || array_empty(a))
+ return;
+ for (ae = element_forw(a->head); ae != a->head; ae = element_forw(ae))
+ if ((*func)(ae, udata) < 0)
+ return;
+}
+
+/*
+ * Shift the array A N elements to the left. Delete the first N elements
+ * and subtract N from the indices of the remaining elements. If FLAGS
+ * does not include AS_DISPOSE, this returns a singly-linked null-terminated
+ * list of elements so the caller can dispose of the chain. If FLAGS
+ * includes AS_DISPOSE, this function disposes of the shifted-out elements
+ * and returns NULL.
+ */
+ARRAY_ELEMENT *
+array_shift(a, n, flags)
+ARRAY *a;
+int n, flags;
+{
+ register ARRAY_ELEMENT *ae, *ret;
+ register int i;
+
+ if (a == 0 || array_empty(a) || n <= 0)
+ return ((ARRAY_ELEMENT *)NULL);
+
+ INVALIDATE_LASTREF(a);
+ for (i = 0, ret = ae = element_forw(a->head); ae != a->head && i < n; ae = element_forw(ae), i++)
+ ;
+ if (ae == a->head) {
+ /* Easy case; shifting out all of the elements */
+ if (flags & AS_DISPOSE) {
+ array_flush (a);
+ return ((ARRAY_ELEMENT *)NULL);
+ }
+ for (ae = ret; element_forw(ae) != a->head; ae = element_forw(ae))
+ ;
+ element_forw(ae) = (ARRAY_ELEMENT *)NULL;
+ a->head->next = a->head->prev = a->head;
+ a->max_index = -1;
+ a->num_elements = 0;
+ return ret;
+ }
+ /*
+ * ae now points to the list of elements we want to retain.
+ * ret points to the list we want to either destroy or return.
+ */
+ ae->prev->next = (ARRAY_ELEMENT *)NULL; /* null-terminate RET */
+
+ a->head->next = ae; /* slice RET out of the array */
+ ae->prev = a->head;
+
+ for ( ; ae != a->head; ae = element_forw(ae))
+ element_index(ae) -= n; /* renumber retained indices */
+
+ a->num_elements -= n; /* modify bookkeeping information */
+ a->max_index = element_index(a->head->prev);
+
+ if (flags & AS_DISPOSE) {
+ for (ae = ret; ae; ) {
+ ret = element_forw(ae);
+ array_dispose_element(ae);
+ ae = ret;
+ }
+ return ((ARRAY_ELEMENT *)NULL);
+ }
+
+ return ret;
+}
+
+/*
+ * Shift array A right N indices. If S is non-null, it becomes the value of
+ * the new element 0. Returns the number of elements in the array after the
+ * shift.
+ */
+int
+array_rshift (a, n, s)
+ARRAY *a;
+int n;
+char *s;
+{
+ register ARRAY_ELEMENT *ae, *new;
+
+ if (a == 0 || (array_empty(a) && s == 0))
+ return 0;
+ else if (n <= 0)
+ return (a->num_elements);
+
+ ae = element_forw(a->head);
+ if (s) {
+ new = array_create_element(0, s);
+ ADD_BEFORE(ae, new);
+ a->num_elements++;
+ if (array_num_elements(a) == 1) { /* array was empty */
+ a->max_index = 0;
+ return 1;
+ }
+ }
+
+ /*
+ * Renumber all elements in the array except the one we just added.
+ */
+ for ( ; ae != a->head; ae = element_forw(ae))
+ element_index(ae) += n;
+
+ a->max_index = element_index(a->head->prev);
+
+ INVALIDATE_LASTREF(a);
+ return (a->num_elements);
+}
+
+ARRAY_ELEMENT *
+array_unshift_element(a)
+ARRAY *a;
+{
+ return (array_shift (a, 1, 0));
+}
+
+int
+array_shift_element(a, v)
+ARRAY *a;
+char *v;
+{
+ return (array_rshift (a, 1, v));
+}
+
+ARRAY *
+array_quote(array)
+ARRAY *array;
+{
+ ARRAY_ELEMENT *a;
+ char *t;
+
+ if (array == 0 || array_head(array) == 0 || array_empty(array))
+ return (ARRAY *)NULL;
+ for (a = element_forw(array->head); a != array->head; a = element_forw(a)) {
+ t = quote_string (a->value);
+ FREE(a->value);
+ a->value = t;
+ }
+ return array;
+}
+
+ARRAY *
+array_quote_escapes(array)
+ARRAY *array;
+{
+ ARRAY_ELEMENT *a;
+ char *t;
+
+ if (array == 0 || array_head(array) == 0 || array_empty(array))
+ return (ARRAY *)NULL;
+ for (a = element_forw(array->head); a != array->head; a = element_forw(a)) {
+ t = quote_escapes (a->value);
+ FREE(a->value);
+ a->value = t;
+ }
+ return array;
+}
+
+ARRAY *
+array_dequote(array)
+ARRAY *array;
+{
+ ARRAY_ELEMENT *a;
+ char *t;
+
+ if (array == 0 || array_head(array) == 0 || array_empty(array))
+ return (ARRAY *)NULL;
+ for (a = element_forw(array->head); a != array->head; a = element_forw(a)) {
+ t = dequote_string (a->value);
+ FREE(a->value);
+ a->value = t;
+ }
+ return array;
+}
+
+ARRAY *
+array_dequote_escapes(array)
+ARRAY *array;
+{
+ ARRAY_ELEMENT *a;
+ char *t;
+
+ if (array == 0 || array_head(array) == 0 || array_empty(array))
+ return (ARRAY *)NULL;
+ for (a = element_forw(array->head); a != array->head; a = element_forw(a)) {
+ t = dequote_escapes (a->value);
+ FREE(a->value);
+ a->value = t;
+ }
+ return array;
+}
+
+ARRAY *
+array_remove_quoted_nulls(array)
+ARRAY *array;
+{
+ ARRAY_ELEMENT *a;
+
+ if (array == 0 || array_head(array) == 0 || array_empty(array))
+ return (ARRAY *)NULL;
+ for (a = element_forw(array->head); a != array->head; a = element_forw(a))
+ a->value = remove_quoted_nulls (a->value);
+ return array;
+}
+
+/*
+ * Return a string whose elements are the members of array A beginning at
+ * index START and spanning NELEM members. Null elements are counted.
+ * Since arrays are sparse, unset array elements are not counted.
+ */
+char *
+array_subrange (a, start, nelem, starsub, quoted, pflags)
+ARRAY *a;
+arrayind_t start, nelem;
+int starsub, quoted, pflags;
+{
+ ARRAY *a2;
+ ARRAY_ELEMENT *h, *p;
+ arrayind_t i;
+ char *t;
+ WORD_LIST *wl;
+
+ p = a ? array_head (a) : 0;
+ if (p == 0 || array_empty (a) || start > array_max_index(a))
+ return ((char *)NULL);
+
+ /*
+ * Find element with index START. If START corresponds to an unset
+ * element (arrays can be sparse), use the first element whose index
+ * is >= START. If START is < 0, we count START indices back from
+ * the end of A (not elements, even with sparse arrays -- START is an
+ * index).
+ */
+ for (p = element_forw(p); p != array_head(a) && start > element_index(p); p = element_forw(p))
+ ;
+
+ if (p == a->head)
+ return ((char *)NULL);
+
+ /* Starting at P, take NELEM elements, inclusive. */
+ for (i = 0, h = p; p != a->head && i < nelem; i++, p = element_forw(p))
+ ;
+
+ a2 = array_slice(a, h, p);
+
+ wl = array_to_word_list(a2);
+ array_dispose(a2);
+ if (wl == 0)
+ return (char *)NULL;
+ t = string_list_pos_params(starsub ? '*' : '@', wl, quoted, pflags); /* XXX */
+ dispose_words(wl);
+
+ return t;
+}
+
+char *
+array_patsub (a, pat, rep, mflags)
+ARRAY *a;
+char *pat, *rep;
+int mflags;
+{
+ char *t;
+ int pchar, qflags, pflags;
+ WORD_LIST *wl, *save;
+
+ if (a == 0 || array_head(a) == 0 || array_empty(a))
+ return ((char *)NULL);
+
+ wl = array_to_word_list(a);
+ if (wl == 0)
+ return (char *)NULL;
+
+ for (save = wl; wl; wl = wl->next) {
+ t = pat_subst (wl->word->word, pat, rep, mflags);
+ FREE (wl->word->word);
+ wl->word->word = t;
+ }
+
+ pchar = (mflags & MATCH_STARSUB) == MATCH_STARSUB ? '*' : '@';
+ qflags = (mflags & MATCH_QUOTED) == MATCH_QUOTED ? Q_DOUBLE_QUOTES : 0;
+ pflags = (mflags & MATCH_ASSIGNRHS) ? PF_ASSIGNRHS : 0;
+
+ t = string_list_pos_params (pchar, save, qflags, pflags);
+ dispose_words(save);
+
+ return t;
+}
+
+char *
+array_modcase (a, pat, modop, mflags)
+ARRAY *a;
+char *pat;
+int modop;
+int mflags;
+{
+ char *t;
+ int pchar, qflags, pflags;
+ WORD_LIST *wl, *save;
+
+ if (a == 0 || array_head(a) == 0 || array_empty(a))
+ return ((char *)NULL);
+
+ wl = array_to_word_list(a);
+ if (wl == 0)
+ return ((char *)NULL);
+
+ for (save = wl; wl; wl = wl->next) {
+ t = sh_modcase(wl->word->word, pat, modop);
+ FREE(wl->word->word);
+ wl->word->word = t;
+ }
+
+ pchar = (mflags & MATCH_STARSUB) == MATCH_STARSUB ? '*' : '@';
+ qflags = (mflags & MATCH_QUOTED) == MATCH_QUOTED ? Q_DOUBLE_QUOTES : 0;
+ pflags = (mflags & MATCH_ASSIGNRHS) ? PF_ASSIGNRHS : 0;
+
+ t = string_list_pos_params (pchar, save, qflags, pflags);
+ dispose_words(save);
+
+ return t;
+}
+
+/*
+ * Allocate and return a new array element with index INDEX and value
+ * VALUE.
+ */
+ARRAY_ELEMENT *
+array_create_element(indx, value)
+arrayind_t indx;
+char *value;
+{
+ ARRAY_ELEMENT *r;
+
+ r = (ARRAY_ELEMENT *)xmalloc(sizeof(ARRAY_ELEMENT));
+ r->ind = indx;
+ r->value = value ? savestring(value) : (char *)NULL;
+ r->next = r->prev = (ARRAY_ELEMENT *) NULL;
+ return(r);
+}
+
+#ifdef INCLUDE_UNUSED
+ARRAY_ELEMENT *
+array_copy_element(ae)
+ARRAY_ELEMENT *ae;
+{
+ return(ae ? array_create_element(element_index(ae), element_value(ae))
+ : (ARRAY_ELEMENT *) NULL);
+}
+#endif
+
+void
+array_dispose_element(ae)
+ARRAY_ELEMENT *ae;
+{
+ if (ae) {
+ FREE(ae->value);
+ free(ae);
+ }
+}
+
+/*
+ * Add a new element with index I and value V to array A (a[i] = v).
+ */
+int
+array_insert(a, i, v)
+ARRAY *a;
+arrayind_t i;
+char *v;
+{
+ register ARRAY_ELEMENT *new, *ae, *start;
+ arrayind_t startind;
+ int direction;
+
+ if (a == 0)
+ return(-1);
+ new = array_create_element(i, v);
+ if (i > array_max_index(a)) {
+ /*
+ * Hook onto the end. This also works for an empty array.
+ * Fast path for the common case of allocating arrays
+ * sequentially.
+ */
+ ADD_BEFORE(a->head, new);
+ a->max_index = i;
+ a->num_elements++;
+ SET_LASTREF(a, new);
+ return(0);
+ } else if (i < array_first_index(a)) {
+ /* Hook at the beginning */
+ ADD_AFTER(a->head, new);
+ a->num_elements++;
+ SET_LASTREF(a, new);
+ return(0);
+ }
+#if OPTIMIZE_SEQUENTIAL_ARRAY_ASSIGNMENT
+ /*
+ * Otherwise we search for the spot to insert it. The lastref
+ * handle optimizes the case of sequential or almost-sequential
+ * assignments that are not at the end of the array.
+ */
+ start = LASTREF(a);
+ /* Use same strategy as array_reference to avoid paying large penalty
+ for semi-random assignment pattern. */
+ startind = element_index(start);
+ if (i < startind/2) {
+ start = element_forw(a->head);
+ startind = element_index(start);
+ direction = 1;
+ } else if (i >= startind) {
+ direction = 1;
+ } else {
+ direction = -1;
+ }
+#else
+ start = element_forw(ae->head);
+ startind = element_index(start);
+ direction = 1;
+#endif
+ for (ae = start; ae != a->head; ) {
+ if (element_index(ae) == i) {
+ /*
+ * Replacing an existing element.
+ */
+ free(element_value(ae));
+ /* Just swap in the new value */
+ ae->value = new->value;
+ new->value = 0;
+ array_dispose_element(new);
+ SET_LASTREF(a, ae);
+ return(0);
+ } else if (direction == 1 && element_index(ae) > i) {
+ ADD_BEFORE(ae, new);
+ a->num_elements++;
+ SET_LASTREF(a, new);
+ return(0);
+ } else if (direction == -1 && element_index(ae) < i) {
+ ADD_AFTER(ae, new);
+ a->num_elements++;
+ SET_LASTREF(a, new);
+ return(0);
+ }
+ ae = direction == 1 ? element_forw(ae) : element_back(ae);
+ }
+ array_dispose_element(new);
+ INVALIDATE_LASTREF(a);
+ return (-1); /* problem */
+}
+
+/*
+ * Delete the element with index I from array A and return it so the
+ * caller can dispose of it.
+ */
+ARRAY_ELEMENT *
+array_remove(a, i)
+ARRAY *a;
+arrayind_t i;
+{
+ register ARRAY_ELEMENT *ae, *start;
+ arrayind_t startind;
+ int direction;
+
+ if (a == 0 || array_empty(a))
+ return((ARRAY_ELEMENT *) NULL);
+ if (i > array_max_index(a) || i < array_first_index(a))
+ return((ARRAY_ELEMENT *)NULL); /* Keep roving pointer into array to optimize sequential access */
+ start = LASTREF(a);
+ /* Use same strategy as array_reference to avoid paying large penalty
+ for semi-random assignment pattern. */
+ startind = element_index(start);
+ if (i < startind/2) {
+ start = element_forw(a->head);
+ startind = element_index(start);
+ direction = 1;
+ } else if (i >= startind) {
+ direction = 1;
+ } else {
+ direction = -1;
+ }
+ for (ae = start; ae != a->head; ) {
+ if (element_index(ae) == i) {
+ ae->next->prev = ae->prev;
+ ae->prev->next = ae->next;
+ a->num_elements--;
+ if (i == array_max_index(a))
+ a->max_index = element_index(ae->prev);
+#if 0
+ INVALIDATE_LASTREF(a);
+#else
+ if (ae->next != a->head)
+ SET_LASTREF(a, ae->next);
+ else if (ae->prev != a->head)
+ SET_LASTREF(a, ae->prev);
+ else
+ INVALIDATE_LASTREF(a);
+#endif
+ return(ae);
+ }
+ ae = (direction == 1) ? element_forw(ae) : element_back(ae);
+ if (direction == 1 && element_index(ae) > i)
+ break;
+ else if (direction == -1 && element_index(ae) < i)
+ break;
+ }
+ return((ARRAY_ELEMENT *) NULL);
+}
+
+/*
+ * Return the value of a[i].
+ */
+char *
+array_reference(a, i)
+ARRAY *a;
+arrayind_t i;
+{
+ register ARRAY_ELEMENT *ae, *start;
+ arrayind_t startind;
+ int direction;
+
+ if (a == 0 || array_empty(a))
+ return((char *) NULL);
+ if (i > array_max_index(a) || i < array_first_index(a))
+ return((char *)NULL); /* Keep roving pointer into array to optimize sequential access */
+ start = LASTREF(a); /* lastref pointer */
+ startind = element_index(start);
+ if (i < startind/2) { /* XXX - guess */
+ start = element_forw(a->head);
+ startind = element_index(start);
+ direction = 1;
+ } else if (i >= startind) {
+ direction = 1;
+ } else {
+ direction = -1;
+ }
+ for (ae = start; ae != a->head; ) {
+ if (element_index(ae) == i) {
+ SET_LASTREF(a, ae);
+ return(element_value(ae));
+ }
+ ae = (direction == 1) ? element_forw(ae) : element_back(ae);
+ /* Take advantage of index ordering to short-circuit */
+ /* If we don't find it, set the lastref pointer to the element
+ that's `closest', assuming that the unsuccessful reference
+ will quickly be followed by an assignment. No worse than
+ not changing it from the previous value or resetting it. */
+ if (direction == 1 && element_index(ae) > i) {
+ start = ae; /* use for SET_LASTREF below */
+ break;
+ } else if (direction == -1 && element_index(ae) < i) {
+ start = ae; /* use for SET_LASTREF below */
+ break;
+ }
+ }
+#if 0
+ UNSET_LASTREF(a);
+#else
+ SET_LASTREF(a, start);
+#endif
+ return((char *) NULL);
+}
+
+/* Convenience routines for the shell to translate to and from the form used
+ by the rest of the code. */
+
+WORD_LIST *
+array_to_word_list(a)
+ARRAY *a;
+{
+ WORD_LIST *list;
+ ARRAY_ELEMENT *ae;
+
+ if (a == 0 || array_empty(a))
+ return((WORD_LIST *)NULL);
+ list = (WORD_LIST *)NULL;
+ for (ae = element_forw(a->head); ae != a->head; ae = element_forw(ae))
+ list = make_word_list (make_bare_word(element_value(ae)), list);
+ return (REVERSE_LIST(list, WORD_LIST *));
+}
+
+ARRAY *
+array_from_word_list (list)
+WORD_LIST *list;
+{
+ ARRAY *a;
+
+ if (list == 0)
+ return((ARRAY *)NULL);
+ a = array_create();
+ return (array_assign_list (a, list));
+}
+
+WORD_LIST *
+array_keys_to_word_list(a)
+ARRAY *a;
+{
+ WORD_LIST *list;
+ ARRAY_ELEMENT *ae;
+ char *t;
+
+ if (a == 0 || array_empty(a))
+ return((WORD_LIST *)NULL);
+ list = (WORD_LIST *)NULL;
+ for (ae = element_forw(a->head); ae != a->head; ae = element_forw(ae)) {
+ t = itos(element_index(ae));
+ list = make_word_list (make_bare_word(t), list);
+ free(t);
+ }
+ return (REVERSE_LIST(list, WORD_LIST *));
+}
+
+ARRAY *
+array_assign_list (array, list)
+ARRAY *array;
+WORD_LIST *list;
+{
+ register WORD_LIST *l;
+ register arrayind_t i;
+
+ for (l = list, i = 0; l; l = l->next, i++)
+ array_insert(array, i, l->word->word);
+ return array;
+}
+
+char **
+array_to_argv (a, countp)
+ARRAY *a;
+int *countp;
+{
+ char **ret, *t;
+ int i;
+ ARRAY_ELEMENT *ae;
+
+ if (a == 0 || array_empty(a)) {
+ if (countp)
+ *countp = 0;
+ return ((char **)NULL);
+ }
+ ret = strvec_create (array_num_elements (a) + 1);
+ i = 0;
+ for (ae = element_forw(a->head); ae != a->head; ae = element_forw(ae)) {
+ t = element_value (ae);
+ if (t)
+ ret[i++] = savestring (t);
+ }
+ ret[i] = (char *)NULL;
+ if (countp)
+ *countp = i;
+ return (ret);
+}
+
+/*
+ * Return a string that is the concatenation of the elements in A from START
+ * to END, separated by SEP.
+ */
+static char *
+array_to_string_internal (start, end, sep, quoted)
+ARRAY_ELEMENT *start, *end;
+char *sep;
+int quoted;
+{
+ char *result, *t;
+ ARRAY_ELEMENT *ae;
+ int slen, rsize, rlen, reg;
+
+ if (start == end) /* XXX - should not happen */
+ return ((char *)NULL);
+
+ slen = strlen(sep);
+ result = NULL;
+ for (rsize = rlen = 0, ae = start; ae != end; ae = element_forw(ae)) {
+ if (rsize == 0)
+ result = (char *)xmalloc (rsize = 64);
+ if (element_value(ae)) {
+ t = quoted ? quote_string(element_value(ae)) : element_value(ae);
+ reg = strlen(t);
+ RESIZE_MALLOCED_BUFFER (result, rlen, (reg + slen + 2),
+ rsize, rsize);
+ strcpy(result + rlen, t);
+ rlen += reg;
+ if (quoted)
+ free(t);
+ /*
+ * Add a separator only after non-null elements.
+ */
+ if (element_forw(ae) != end) {
+ strcpy(result + rlen, sep);
+ rlen += slen;
+ }
+ }
+ }
+ if (result)
+ result[rlen] = '\0'; /* XXX */
+ return(result);
+}
+
+char *
+array_to_kvpair (a, quoted)
+ARRAY *a;
+int quoted;
+{
+ char *result, *valstr, *is;
+ char indstr[INT_STRLEN_BOUND(intmax_t) + 1];
+ ARRAY_ELEMENT *ae;
+ int rsize, rlen, elen;
+
+ if (a == 0 || array_empty (a))
+ return((char *)NULL);
+
+ result = (char *)xmalloc (rsize = 128);
+ result[rlen = 0] = '\0';
+
+ for (ae = element_forw(a->head); ae != a->head; ae = element_forw(ae)) {
+ is = inttostr (element_index(ae), indstr, sizeof(indstr));
+ valstr = element_value (ae) ?
+ (ansic_shouldquote (element_value (ae)) ?
+ ansic_quote (element_value(ae), 0, (int *)0) :
+ sh_double_quote (element_value (ae)))
+ : (char *)NULL;
+ elen = STRLEN (is) + 8 + STRLEN (valstr);
+ RESIZE_MALLOCED_BUFFER (result, rlen, (elen + 1), rsize, rsize);
+
+ strcpy (result + rlen, is);
+ rlen += STRLEN (is);
+ result[rlen++] = ' ';
+ if (valstr) {
+ strcpy (result + rlen, valstr);
+ rlen += STRLEN (valstr);
+ } else {
+ strcpy (result + rlen, "\"\"");
+ rlen += 2;
+ }
+
+ if (element_forw(ae) != a->head)
+ result[rlen++] = ' ';
+
+ FREE (valstr);
+ }
+ RESIZE_MALLOCED_BUFFER (result, rlen, 1, rsize, 8);
+ result[rlen] = '\0';
+
+ if (quoted) {
+ /* This is not as efficient as it could be... */
+ valstr = sh_single_quote (result);
+ free (result);
+ result = valstr;
+ }
+ return(result);
+}
+
+char *
+array_to_assign (a, quoted)
+ARRAY *a;
+int quoted;
+{
+ char *result, *valstr, *is;
+ char indstr[INT_STRLEN_BOUND(intmax_t) + 1];
+ ARRAY_ELEMENT *ae;
+ int rsize, rlen, elen;
+
+ if (a == 0 || array_empty (a))
+ return((char *)NULL);
+
+ result = (char *)xmalloc (rsize = 128);
+ result[0] = '(';
+ rlen = 1;
+
+ for (ae = element_forw(a->head); ae != a->head; ae = element_forw(ae)) {
+ is = inttostr (element_index(ae), indstr, sizeof(indstr));
+ valstr = element_value (ae) ?
+ (ansic_shouldquote (element_value (ae)) ?
+ ansic_quote (element_value(ae), 0, (int *)0) :
+ sh_double_quote (element_value (ae)))
+ : (char *)NULL;
+ elen = STRLEN (is) + 8 + STRLEN (valstr);
+ RESIZE_MALLOCED_BUFFER (result, rlen, (elen + 1), rsize, rsize);
+
+ result[rlen++] = '[';
+ strcpy (result + rlen, is);
+ rlen += STRLEN (is);
+ result[rlen++] = ']';
+ result[rlen++] = '=';
+ if (valstr) {
+ strcpy (result + rlen, valstr);
+ rlen += STRLEN (valstr);
+ }
+
+ if (element_forw(ae) != a->head)
+ result[rlen++] = ' ';
+
+ FREE (valstr);
+ }
+ RESIZE_MALLOCED_BUFFER (result, rlen, 1, rsize, 8);
+ result[rlen++] = ')';
+ result[rlen] = '\0';
+ if (quoted) {
+ /* This is not as efficient as it could be... */
+ valstr = sh_single_quote (result);
+ free (result);
+ result = valstr;
+ }
+ return(result);
+}
+
+char *
+array_to_string (a, sep, quoted)
+ARRAY *a;
+char *sep;
+int quoted;
+{
+ if (a == 0)
+ return((char *)NULL);
+ if (array_empty(a))
+ return(savestring(""));
+ return (array_to_string_internal (element_forw(a->head), a->head, sep, quoted));
+}
+
+#if defined (INCLUDE_UNUSED) || defined (TEST_ARRAY)
+/*
+ * Return an array consisting of elements in S, separated by SEP
+ */
+ARRAY *
+array_from_string(s, sep)
+char *s, *sep;
+{
+ ARRAY *a;
+ WORD_LIST *w;
+
+ if (s == 0)
+ return((ARRAY *)NULL);
+ w = list_string (s, sep, 0);
+ if (w == 0)
+ return((ARRAY *)NULL);
+ a = array_from_word_list (w);
+ return (a);
+}
+#endif
+
+#if defined (TEST_ARRAY)
+/*
+ * To make a running version, compile -DTEST_ARRAY and link with:
+ * xmalloc.o syntax.o lib/malloc/libmalloc.a lib/sh/libsh.a
+ */
+int interrupt_immediately = 0;
+
+int
+signal_is_trapped(s)
+int s;
+{
+ return 0;
+}
+
+void
+fatal_error(const char *s, ...)
+{
+ fprintf(stderr, "array_test: fatal memory error\n");
+ abort();
+}
+
+void
+programming_error(const char *s, ...)
+{
+ fprintf(stderr, "array_test: fatal programming error\n");
+ abort();
+}
+
+WORD_DESC *
+make_bare_word (s)
+const char *s;
+{
+ WORD_DESC *w;
+
+ w = (WORD_DESC *)xmalloc(sizeof(WORD_DESC));
+ w->word = s ? savestring(s) : savestring ("");
+ w->flags = 0;
+ return w;
+}
+
+WORD_LIST *
+make_word_list(x, l)
+WORD_DESC *x;
+WORD_LIST *l;
+{
+ WORD_LIST *w;
+
+ w = (WORD_LIST *)xmalloc(sizeof(WORD_LIST));
+ w->word = x;
+ w->next = l;
+ return w;
+}
+
+WORD_LIST *
+list_string(s, t, i)
+char *s, *t;
+int i;
+{
+ char *r, *a;
+ WORD_LIST *wl;
+
+ if (s == 0)
+ return (WORD_LIST *)NULL;
+ r = savestring(s);
+ wl = (WORD_LIST *)NULL;
+ a = strtok(r, t);
+ while (a) {
+ wl = make_word_list (make_bare_word(a), wl);
+ a = strtok((char *)NULL, t);
+ }
+ return (REVERSE_LIST (wl, WORD_LIST *));
+}
+
+GENERIC_LIST *
+list_reverse (list)
+GENERIC_LIST *list;
+{
+ register GENERIC_LIST *next, *prev;
+
+ for (prev = 0; list; ) {
+ next = list->next;
+ list->next = prev;
+ prev = list;
+ list = next;
+ }
+ return prev;
+}
+
+char *
+pat_subst(s, t, u, i)
+char *s, *t, *u;
+int i;
+{
+ return ((char *)NULL);
+}
+
+char *
+quote_string(s)
+char *s;
+{
+ return savestring(s);
+}
+
+print_element(ae)
+ARRAY_ELEMENT *ae;
+{
+ char lbuf[INT_STRLEN_BOUND (intmax_t) + 1];
+
+ printf("array[%s] = %s\n",
+ inttostr (element_index(ae), lbuf, sizeof (lbuf)),
+ element_value(ae));
+}
+
+print_array(a)
+ARRAY *a;
+{
+ printf("\n");
+ array_walk(a, print_element, (void *)NULL);
+}
+
+main()
+{
+ ARRAY *a, *new_a, *copy_of_a;
+ ARRAY_ELEMENT *ae, *aew;
+ char *s;
+
+ a = array_create();
+ array_insert(a, 1, "one");
+ array_insert(a, 7, "seven");
+ array_insert(a, 4, "four");
+ array_insert(a, 1029, "one thousand twenty-nine");
+ array_insert(a, 12, "twelve");
+ array_insert(a, 42, "forty-two");
+ print_array(a);
+ s = array_to_string (a, " ", 0);
+ printf("s = %s\n", s);
+ copy_of_a = array_from_string(s, " ");
+ printf("copy_of_a:");
+ print_array(copy_of_a);
+ array_dispose(copy_of_a);
+ printf("\n");
+ free(s);
+ ae = array_remove(a, 4);
+ array_dispose_element(ae);
+ ae = array_remove(a, 1029);
+ array_dispose_element(ae);
+ array_insert(a, 16, "sixteen");
+ print_array(a);
+ s = array_to_string (a, " ", 0);
+ printf("s = %s\n", s);
+ copy_of_a = array_from_string(s, " ");
+ printf("copy_of_a:");
+ print_array(copy_of_a);
+ array_dispose(copy_of_a);
+ printf("\n");
+ free(s);
+ array_insert(a, 2, "two");
+ array_insert(a, 1029, "new one thousand twenty-nine");
+ array_insert(a, 0, "zero");
+ array_insert(a, 134, "");
+ print_array(a);
+ s = array_to_string (a, ":", 0);
+ printf("s = %s\n", s);
+ copy_of_a = array_from_string(s, ":");
+ printf("copy_of_a:");
+ print_array(copy_of_a);
+ array_dispose(copy_of_a);
+ printf("\n");
+ free(s);
+ new_a = array_copy(a);
+ print_array(new_a);
+ s = array_to_string (new_a, ":", 0);
+ printf("s = %s\n", s);
+ copy_of_a = array_from_string(s, ":");
+ free(s);
+ printf("copy_of_a:");
+ print_array(copy_of_a);
+ array_shift(copy_of_a, 2, AS_DISPOSE);
+ printf("copy_of_a shifted by two:");
+ print_array(copy_of_a);
+ ae = array_shift(copy_of_a, 2, 0);
+ printf("copy_of_a shifted by two:");
+ print_array(copy_of_a);
+ for ( ; ae; ) {
+ aew = element_forw(ae);
+ array_dispose_element(ae);
+ ae = aew;
+ }
+ array_rshift(copy_of_a, 1, (char *)0);
+ printf("copy_of_a rshift by 1:");
+ print_array(copy_of_a);
+ array_rshift(copy_of_a, 2, "new element zero");
+ printf("copy_of_a rshift again by 2 with new element zero:");
+ print_array(copy_of_a);
+ s = array_to_assign(copy_of_a, 0);
+ printf("copy_of_a=%s\n", s);
+ free(s);
+ ae = array_shift(copy_of_a, array_num_elements(copy_of_a), 0);
+ for ( ; ae; ) {
+ aew = element_forw(ae);
+ array_dispose_element(ae);
+ ae = aew;
+ }
+ array_dispose(copy_of_a);
+ printf("\n");
+ array_dispose(a);
+ array_dispose(new_a);
+}
+
+#endif /* TEST_ARRAY */
+#endif /* ARRAY_VARS */