mirror of https://gitee.com/openkylin/linux.git
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <stdlib.h>
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#include "strbuf.h"
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#include "quote.h"
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#include "util.h"
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/* Help to copy the thing properly quoted for the shell safety.
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* any single quote is replaced with '\'', any exclamation point
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* is replaced with '\!', and the whole thing is enclosed in a
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*
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* E.g.
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* original sq_quote result
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* name ==> name ==> 'name'
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* a b ==> a b ==> 'a b'
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* a'b ==> a'\''b ==> 'a'\''b'
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* a!b ==> a'\!'b ==> 'a'\!'b'
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*/
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static inline int need_bs_quote(char c)
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{
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return (c == '\'' || c == '!');
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}
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static int sq_quote_buf(struct strbuf *dst, const char *src)
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{
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char *to_free = NULL;
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int ret;
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if (dst->buf == src)
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to_free = strbuf_detach(dst, NULL);
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ret = strbuf_addch(dst, '\'');
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while (!ret && *src) {
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size_t len = strcspn(src, "'!");
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ret = strbuf_add(dst, src, len);
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src += len;
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while (!ret && need_bs_quote(*src))
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ret = strbuf_addf(dst, "'\\%c\'", *src++);
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}
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if (!ret)
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ret = strbuf_addch(dst, '\'');
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free(to_free);
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return ret;
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}
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int sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
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{
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int i, ret;
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/* Copy into destination buffer. */
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ret = strbuf_grow(dst, 255);
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for (i = 0; !ret && argv[i]; ++i) {
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ret = strbuf_addch(dst, ' ');
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if (ret)
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break;
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ret = sq_quote_buf(dst, argv[i]);
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if (maxlen && dst->len > maxlen)
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return -ENOSPC;
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}
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return ret;
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}
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