mirror of
https://github.com/morgan9e/systemd
synced 2026-04-15 08:56:15 +09:00
319a4f4bc4
We recently started making more use of malloc_usable_size() and rely on it (see the string_erase() story). Given that we don't really support sytems where malloc_usable_size() cannot be trusted beyond statistics anyway, let's go fully in and rework GREEDY_REALLOC() on top of it: instead of passing around and maintaining the currenly allocated size everywhere, let's just derive it automatically from malloc_usable_size(). I am mostly after this for the simplicity this brings. It also brings minor efficiency improvements I guess, but things become so much nicer to look at if we can avoid these allocation size variables everywhere. Note that the malloc_usable_size() man page says relying on it wasn't "good programming practice", but I think it does this for reasons that don't apply here: the greedy realloc logic specifically doesn't rely on the returned extra size, beyond the fact that it is equal or larger than what was requested. (This commit was supposed to be a quick patch btw, but apparently we use the greedy realloc stuff quite a bit across the codebase, so this ends up touching *a*lot* of code.)
997 lines
22 KiB
C
997 lines
22 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <fnmatch.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "alloc-util.h"
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#include "escape.h"
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#include "extract-word.h"
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#include "fileio.h"
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#include "memory-util.h"
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#include "nulstr-util.h"
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#include "sort-util.h"
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#include "string-util.h"
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#include "strv.h"
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char *strv_find(char * const *l, const char *name) {
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char * const *i;
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assert(name);
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STRV_FOREACH(i, l)
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if (streq(*i, name))
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return *i;
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return NULL;
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}
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char *strv_find_case(char * const *l, const char *name) {
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char * const *i;
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assert(name);
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STRV_FOREACH(i, l)
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if (strcaseeq(*i, name))
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return *i;
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return NULL;
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}
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char *strv_find_prefix(char * const *l, const char *name) {
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char * const *i;
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assert(name);
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STRV_FOREACH(i, l)
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if (startswith(*i, name))
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return *i;
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return NULL;
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}
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char *strv_find_startswith(char * const *l, const char *name) {
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char * const *i, *e;
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assert(name);
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/* Like strv_find_prefix, but actually returns only the
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* suffix, not the whole item */
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STRV_FOREACH(i, l) {
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e = startswith(*i, name);
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if (e)
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return e;
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}
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return NULL;
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}
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char **strv_free(char **l) {
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char **k;
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if (!l)
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return NULL;
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for (k = l; *k; k++)
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free(*k);
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return mfree(l);
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}
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char **strv_free_erase(char **l) {
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char **i;
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STRV_FOREACH(i, l)
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erase_and_freep(i);
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return mfree(l);
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}
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char **strv_copy(char * const *l) {
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char **r, **k;
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k = r = new(char*, strv_length(l) + 1);
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if (!r)
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return NULL;
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if (l)
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for (; *l; k++, l++) {
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*k = strdup(*l);
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if (!*k) {
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strv_free(r);
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return NULL;
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}
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}
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*k = NULL;
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return r;
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}
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size_t strv_length(char * const *l) {
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size_t n = 0;
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if (!l)
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return 0;
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for (; *l; l++)
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n++;
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return n;
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}
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char **strv_new_ap(const char *x, va_list ap) {
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_cleanup_strv_free_ char **a = NULL;
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size_t n = 0, i = 0;
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va_list aq;
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/* As a special trick we ignore all listed strings that equal
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* STRV_IGNORE. This is supposed to be used with the
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* STRV_IFNOTNULL() macro to include possibly NULL strings in
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* the string list. */
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va_copy(aq, ap);
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for (const char *s = x; s; s = va_arg(aq, const char*)) {
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if (s == STRV_IGNORE)
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continue;
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n++;
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}
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va_end(aq);
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a = new(char*, n+1);
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if (!a)
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return NULL;
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for (const char *s = x; s; s = va_arg(ap, const char*)) {
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if (s == STRV_IGNORE)
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continue;
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a[i] = strdup(s);
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if (!a[i])
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return NULL;
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i++;
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}
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a[i] = NULL;
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return TAKE_PTR(a);
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}
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char **strv_new_internal(const char *x, ...) {
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char **r;
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va_list ap;
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va_start(ap, x);
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r = strv_new_ap(x, ap);
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va_end(ap);
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return r;
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}
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int strv_extend_strv(char ***a, char * const *b, bool filter_duplicates) {
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char * const *s, **t;
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size_t p, q, i = 0, j;
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assert(a);
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if (strv_isempty(b))
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return 0;
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p = strv_length(*a);
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q = strv_length(b);
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if (p >= SIZE_MAX - q)
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return -ENOMEM;
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t = reallocarray(*a, GREEDY_ALLOC_ROUND_UP(p + q + 1), sizeof(char *));
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if (!t)
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return -ENOMEM;
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t[p] = NULL;
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*a = t;
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STRV_FOREACH(s, b) {
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if (filter_duplicates && strv_contains(t, *s))
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continue;
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t[p+i] = strdup(*s);
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if (!t[p+i])
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goto rollback;
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i++;
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t[p+i] = NULL;
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}
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assert(i <= q);
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return (int) i;
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rollback:
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for (j = 0; j < i; j++)
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free(t[p + j]);
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t[p] = NULL;
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return -ENOMEM;
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}
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int strv_extend_strv_concat(char ***a, char * const *b, const char *suffix) {
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char * const *s;
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int r;
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STRV_FOREACH(s, b) {
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char *v;
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v = strjoin(*s, suffix);
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if (!v)
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return -ENOMEM;
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r = strv_push(a, v);
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if (r < 0) {
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free(v);
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return r;
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}
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}
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return 0;
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}
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int strv_split_newlines_full(char ***ret, const char *s, ExtractFlags flags) {
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_cleanup_strv_free_ char **l = NULL;
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size_t n;
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int r;
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assert(s);
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/* Special version of strv_split_full() that splits on newlines and
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* suppresses an empty string at the end. */
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r = strv_split_full(&l, s, NEWLINE, flags);
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if (r < 0)
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return r;
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n = strv_length(l);
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if (n > 0 && isempty(l[n - 1])) {
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l[n - 1] = mfree(l[n - 1]);
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n--;
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}
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*ret = TAKE_PTR(l);
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return n;
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}
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int strv_split_full(char ***t, const char *s, const char *separators, ExtractFlags flags) {
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_cleanup_strv_free_ char **l = NULL;
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size_t n = 0;
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int r;
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assert(t);
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assert(s);
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for (;;) {
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_cleanup_free_ char *word = NULL;
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r = extract_first_word(&s, &word, separators, flags);
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if (r < 0)
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return r;
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if (r == 0)
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break;
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if (!GREEDY_REALLOC(l, n + 2))
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return -ENOMEM;
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l[n++] = TAKE_PTR(word);
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l[n] = NULL;
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}
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if (!l) {
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l = new0(char*, 1);
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if (!l)
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return -ENOMEM;
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}
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*t = TAKE_PTR(l);
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return (int) n;
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}
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int strv_split_colon_pairs(char ***t, const char *s) {
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_cleanup_strv_free_ char **l = NULL;
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size_t n = 0;
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int r;
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assert(t);
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assert(s);
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for (;;) {
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_cleanup_free_ char *first = NULL, *second = NULL, *tuple = NULL, *second_or_empty = NULL;
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r = extract_first_word(&s, &tuple, NULL, EXTRACT_UNQUOTE|EXTRACT_RETAIN_ESCAPE);
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if (r < 0)
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return r;
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if (r == 0)
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break;
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const char *p = tuple;
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r = extract_many_words(&p, ":", EXTRACT_CUNESCAPE|EXTRACT_UNESCAPE_SEPARATORS,
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&first, &second, NULL);
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if (r < 0)
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return r;
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if (r == 0)
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continue;
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/* Enforce that at most 2 colon-separated words are contained in each group */
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if (!isempty(p))
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return -EINVAL;
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second_or_empty = strdup(strempty(second));
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if (!second_or_empty)
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return -ENOMEM;
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if (!GREEDY_REALLOC(l, n + 3))
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return -ENOMEM;
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l[n++] = TAKE_PTR(first);
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l[n++] = TAKE_PTR(second_or_empty);
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l[n] = NULL;
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}
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if (!l) {
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l = new0(char*, 1);
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if (!l)
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return -ENOMEM;
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}
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*t = TAKE_PTR(l);
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return (int) n;
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}
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char *strv_join_full(char * const *l, const char *separator, const char *prefix, bool unescape_separators) {
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char * const *s;
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char *r, *e;
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size_t n, k, m;
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if (!separator)
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separator = " ";
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k = strlen(separator);
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m = strlen_ptr(prefix);
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if (unescape_separators) /* If there separator is multi-char, we won't know how to escape it. */
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assert(k == 1);
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n = 0;
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STRV_FOREACH(s, l) {
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if (s != l)
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n += k;
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bool needs_escaping = unescape_separators && strchr(*s, separator[0]);
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n += m + strlen(*s) * (1 + needs_escaping);
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}
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r = new(char, n+1);
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if (!r)
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return NULL;
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e = r;
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STRV_FOREACH(s, l) {
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if (s != l)
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e = stpcpy(e, separator);
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if (prefix)
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e = stpcpy(e, prefix);
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bool needs_escaping = unescape_separators && strchr(*s, separator[0]);
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if (needs_escaping)
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for (size_t i = 0; (*s)[i]; i++) {
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if ((*s)[i] == separator[0])
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*(e++) = '\\';
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*(e++) = (*s)[i];
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}
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else
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e = stpcpy(e, *s);
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}
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*e = 0;
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return r;
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}
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int strv_push(char ***l, char *value) {
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char **c;
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size_t n;
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if (!value)
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return 0;
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n = strv_length(*l);
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/* Check for overflow */
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if (n > SIZE_MAX-2)
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return -ENOMEM;
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c = reallocarray(*l, GREEDY_ALLOC_ROUND_UP(n + 2), sizeof(char*));
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if (!c)
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return -ENOMEM;
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c[n] = value;
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c[n+1] = NULL;
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*l = c;
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return 0;
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}
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int strv_push_pair(char ***l, char *a, char *b) {
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char **c;
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size_t n;
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if (!a && !b)
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return 0;
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n = strv_length(*l);
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/* Check for overflow */
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if (n > SIZE_MAX-3)
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return -ENOMEM;
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/* increase and check for overflow */
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c = reallocarray(*l, GREEDY_ALLOC_ROUND_UP(n + !!a + !!b + 1), sizeof(char*));
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if (!c)
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return -ENOMEM;
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if (a)
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c[n++] = a;
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if (b)
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c[n++] = b;
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c[n] = NULL;
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*l = c;
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return 0;
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}
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int strv_insert(char ***l, size_t position, char *value) {
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char **c;
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size_t n, m, i;
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if (!value)
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return 0;
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n = strv_length(*l);
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position = MIN(position, n);
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/* increase and check for overflow */
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m = n + 2;
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if (m < n)
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return -ENOMEM;
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c = new(char*, m);
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if (!c)
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return -ENOMEM;
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for (i = 0; i < position; i++)
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c[i] = (*l)[i];
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c[position] = value;
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for (i = position; i < n; i++)
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c[i+1] = (*l)[i];
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c[n+1] = NULL;
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free(*l);
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*l = c;
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return 0;
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}
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int strv_consume(char ***l, char *value) {
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int r;
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r = strv_push(l, value);
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if (r < 0)
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free(value);
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return r;
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}
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int strv_consume_pair(char ***l, char *a, char *b) {
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int r;
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r = strv_push_pair(l, a, b);
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if (r < 0) {
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free(a);
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free(b);
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}
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return r;
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}
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int strv_consume_prepend(char ***l, char *value) {
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int r;
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r = strv_push_prepend(l, value);
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if (r < 0)
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free(value);
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return r;
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}
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int strv_prepend(char ***l, const char *value) {
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char *v;
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if (!value)
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return 0;
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v = strdup(value);
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if (!v)
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return -ENOMEM;
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return strv_consume_prepend(l, v);
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}
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int strv_extend(char ***l, const char *value) {
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char *v;
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if (!value)
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return 0;
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v = strdup(value);
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if (!v)
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return -ENOMEM;
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return strv_consume(l, v);
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}
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int strv_extend_front(char ***l, const char *value) {
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size_t n, m;
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char *v, **c;
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assert(l);
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/* Like strv_extend(), but prepends rather than appends the new entry */
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if (!value)
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return 0;
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n = strv_length(*l);
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/* Increase and overflow check. */
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m = n + 2;
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if (m < n)
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return -ENOMEM;
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v = strdup(value);
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if (!v)
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return -ENOMEM;
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c = reallocarray(*l, m, sizeof(char*));
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if (!c) {
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free(v);
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return -ENOMEM;
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}
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memmove(c+1, c, n * sizeof(char*));
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c[0] = v;
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c[n+1] = NULL;
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*l = c;
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return 0;
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}
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char **strv_uniq(char **l) {
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char **i;
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/* Drops duplicate entries. The first identical string will be
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* kept, the others dropped */
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STRV_FOREACH(i, l)
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strv_remove(i+1, *i);
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return l;
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}
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bool strv_is_uniq(char * const *l) {
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char * const *i;
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STRV_FOREACH(i, l)
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if (strv_find(i+1, *i))
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return false;
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return true;
|
|
}
|
|
|
|
char **strv_remove(char **l, const char *s) {
|
|
char **f, **t;
|
|
|
|
if (!l)
|
|
return NULL;
|
|
|
|
assert(s);
|
|
|
|
/* Drops every occurrence of s in the string list, edits
|
|
* in-place. */
|
|
|
|
for (f = t = l; *f; f++)
|
|
if (streq(*f, s))
|
|
free(*f);
|
|
else
|
|
*(t++) = *f;
|
|
|
|
*t = NULL;
|
|
return l;
|
|
}
|
|
|
|
char **strv_parse_nulstr(const char *s, size_t l) {
|
|
/* l is the length of the input data, which will be split at NULs into
|
|
* elements of the resulting strv. Hence, the number of items in the resulting strv
|
|
* will be equal to one plus the number of NUL bytes in the l bytes starting at s,
|
|
* unless s[l-1] is NUL, in which case the final empty string is not stored in
|
|
* the resulting strv, and length is equal to the number of NUL bytes.
|
|
*
|
|
* Note that contrary to a normal nulstr which cannot contain empty strings, because
|
|
* the input data is terminated by any two consequent NUL bytes, this parser accepts
|
|
* empty strings in s.
|
|
*/
|
|
|
|
const char *p;
|
|
size_t c = 0, i = 0;
|
|
char **v;
|
|
|
|
assert(s || l <= 0);
|
|
|
|
if (l <= 0)
|
|
return new0(char*, 1);
|
|
|
|
for (p = s; p < s + l; p++)
|
|
if (*p == 0)
|
|
c++;
|
|
|
|
if (s[l-1] != 0)
|
|
c++;
|
|
|
|
v = new0(char*, c+1);
|
|
if (!v)
|
|
return NULL;
|
|
|
|
p = s;
|
|
while (p < s + l) {
|
|
const char *e;
|
|
|
|
e = memchr(p, 0, s + l - p);
|
|
|
|
v[i] = strndup(p, e ? e - p : s + l - p);
|
|
if (!v[i]) {
|
|
strv_free(v);
|
|
return NULL;
|
|
}
|
|
|
|
i++;
|
|
|
|
if (!e)
|
|
break;
|
|
|
|
p = e + 1;
|
|
}
|
|
|
|
assert(i == c);
|
|
|
|
return v;
|
|
}
|
|
|
|
char **strv_split_nulstr(const char *s) {
|
|
const char *i;
|
|
char **r = NULL;
|
|
|
|
NULSTR_FOREACH(i, s)
|
|
if (strv_extend(&r, i) < 0) {
|
|
strv_free(r);
|
|
return NULL;
|
|
}
|
|
|
|
if (!r)
|
|
return strv_new(NULL);
|
|
|
|
return r;
|
|
}
|
|
|
|
int strv_make_nulstr(char * const *l, char **ret, size_t *ret_size) {
|
|
/* A valid nulstr with two NULs at the end will be created, but
|
|
* q will be the length without the two trailing NULs. Thus the output
|
|
* string is a valid nulstr and can be iterated over using NULSTR_FOREACH,
|
|
* and can also be parsed by strv_parse_nulstr as long as the length
|
|
* is provided separately.
|
|
*/
|
|
|
|
_cleanup_free_ char *m = NULL;
|
|
char * const *i;
|
|
size_t n = 0;
|
|
|
|
assert(ret);
|
|
assert(ret_size);
|
|
|
|
STRV_FOREACH(i, l) {
|
|
size_t z;
|
|
|
|
z = strlen(*i);
|
|
|
|
if (!GREEDY_REALLOC(m, n + z + 2))
|
|
return -ENOMEM;
|
|
|
|
memcpy(m + n, *i, z + 1);
|
|
n += z + 1;
|
|
}
|
|
|
|
if (!m) {
|
|
m = new0(char, 1);
|
|
if (!m)
|
|
return -ENOMEM;
|
|
n = 1;
|
|
} else
|
|
/* make sure there is a second extra NUL at the end of resulting nulstr */
|
|
m[n] = '\0';
|
|
|
|
assert(n > 0);
|
|
*ret = m;
|
|
*ret_size = n - 1;
|
|
|
|
m = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool strv_overlap(char * const *a, char * const *b) {
|
|
char * const *i;
|
|
|
|
STRV_FOREACH(i, a)
|
|
if (strv_contains(b, *i))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static int str_compare(char * const *a, char * const *b) {
|
|
return strcmp(*a, *b);
|
|
}
|
|
|
|
char **strv_sort(char **l) {
|
|
typesafe_qsort(l, strv_length(l), str_compare);
|
|
return l;
|
|
}
|
|
|
|
int strv_compare(char * const *a, char * const *b) {
|
|
int r;
|
|
|
|
if (strv_isempty(a)) {
|
|
if (strv_isempty(b))
|
|
return 0;
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
if (strv_isempty(b))
|
|
return 1;
|
|
|
|
for ( ; *a || *b; ++a, ++b) {
|
|
r = strcmp_ptr(*a, *b);
|
|
if (r != 0)
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void strv_print(char * const *l) {
|
|
char * const *s;
|
|
|
|
STRV_FOREACH(s, l)
|
|
puts(*s);
|
|
}
|
|
|
|
int strv_extendf(char ***l, const char *format, ...) {
|
|
va_list ap;
|
|
char *x;
|
|
int r;
|
|
|
|
va_start(ap, format);
|
|
r = vasprintf(&x, format, ap);
|
|
va_end(ap);
|
|
|
|
if (r < 0)
|
|
return -ENOMEM;
|
|
|
|
return strv_consume(l, x);
|
|
}
|
|
|
|
char **strv_reverse(char **l) {
|
|
size_t n, i;
|
|
|
|
n = strv_length(l);
|
|
if (n <= 1)
|
|
return l;
|
|
|
|
for (i = 0; i < n / 2; i++)
|
|
SWAP_TWO(l[i], l[n-1-i]);
|
|
|
|
return l;
|
|
}
|
|
|
|
char **strv_shell_escape(char **l, const char *bad) {
|
|
char **s;
|
|
|
|
/* Escapes every character in every string in l that is in bad,
|
|
* edits in-place, does not roll-back on error. */
|
|
|
|
STRV_FOREACH(s, l) {
|
|
char *v;
|
|
|
|
v = shell_escape(*s, bad);
|
|
if (!v)
|
|
return NULL;
|
|
|
|
free(*s);
|
|
*s = v;
|
|
}
|
|
|
|
return l;
|
|
}
|
|
|
|
bool strv_fnmatch_full(char* const* patterns, const char *s, int flags, size_t *matched_pos) {
|
|
for (size_t i = 0; patterns && patterns[i]; i++)
|
|
if (fnmatch(patterns[i], s, flags) == 0) {
|
|
if (matched_pos)
|
|
*matched_pos = i;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
char ***strv_free_free(char ***l) {
|
|
char ***i;
|
|
|
|
if (!l)
|
|
return NULL;
|
|
|
|
for (i = l; *i; i++)
|
|
strv_free(*i);
|
|
|
|
return mfree(l);
|
|
}
|
|
|
|
char **strv_skip(char **l, size_t n) {
|
|
|
|
while (n > 0) {
|
|
if (strv_isempty(l))
|
|
return l;
|
|
|
|
l++, n--;
|
|
}
|
|
|
|
return l;
|
|
}
|
|
|
|
int strv_extend_n(char ***l, const char *value, size_t n) {
|
|
size_t i, j, k;
|
|
char **nl;
|
|
|
|
assert(l);
|
|
|
|
if (!value)
|
|
return 0;
|
|
if (n == 0)
|
|
return 0;
|
|
|
|
/* Adds the value n times to l */
|
|
|
|
k = strv_length(*l);
|
|
if (n >= SIZE_MAX - k)
|
|
return -ENOMEM;
|
|
|
|
nl = reallocarray(*l, GREEDY_ALLOC_ROUND_UP(k + n + 1), sizeof(char *));
|
|
if (!nl)
|
|
return -ENOMEM;
|
|
|
|
*l = nl;
|
|
|
|
for (i = k; i < k + n; i++) {
|
|
nl[i] = strdup(value);
|
|
if (!nl[i])
|
|
goto rollback;
|
|
}
|
|
|
|
nl[i] = NULL;
|
|
return 0;
|
|
|
|
rollback:
|
|
for (j = k; j < i; j++)
|
|
free(nl[j]);
|
|
|
|
nl[k] = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
int fputstrv(FILE *f, char * const *l, const char *separator, bool *space) {
|
|
bool b = false;
|
|
char * const *s;
|
|
int r;
|
|
|
|
/* Like fputs(), but for strv, and with a less stupid argument order */
|
|
|
|
if (!space)
|
|
space = &b;
|
|
|
|
STRV_FOREACH(s, l) {
|
|
r = fputs_with_space(f, *s, separator, space);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int string_strv_hashmap_put_internal(Hashmap *h, const char *key, const char *value) {
|
|
char **l;
|
|
int r;
|
|
|
|
l = hashmap_get(h, key);
|
|
if (l) {
|
|
/* A list for this key already exists, let's append to it if it is not listed yet */
|
|
if (strv_contains(l, value))
|
|
return 0;
|
|
|
|
r = strv_extend(&l, value);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
assert_se(hashmap_update(h, key, l) >= 0);
|
|
} else {
|
|
/* No list for this key exists yet, create one */
|
|
_cleanup_strv_free_ char **l2 = NULL;
|
|
_cleanup_free_ char *t = NULL;
|
|
|
|
t = strdup(key);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
r = strv_extend(&l2, value);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = hashmap_put(h, t, l2);
|
|
if (r < 0)
|
|
return r;
|
|
TAKE_PTR(t);
|
|
TAKE_PTR(l2);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int _string_strv_hashmap_put(Hashmap **h, const char *key, const char *value HASHMAP_DEBUG_PARAMS) {
|
|
int r;
|
|
|
|
r = _hashmap_ensure_allocated(h, &string_strv_hash_ops HASHMAP_DEBUG_PASS_ARGS);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return string_strv_hashmap_put_internal(*h, key, value);
|
|
}
|
|
|
|
int _string_strv_ordered_hashmap_put(OrderedHashmap **h, const char *key, const char *value HASHMAP_DEBUG_PARAMS) {
|
|
int r;
|
|
|
|
r = _ordered_hashmap_ensure_allocated(h, &string_strv_hash_ops HASHMAP_DEBUG_PASS_ARGS);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return string_strv_hashmap_put_internal(PLAIN_HASHMAP(*h), key, value);
|
|
}
|
|
|
|
DEFINE_HASH_OPS_FULL(string_strv_hash_ops, char, string_hash_func, string_compare_func, free, char*, strv_free);
|