93 lines
3.3 KiB
C
93 lines
3.3 KiB
C
/**
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* @file stdbuf_cmdline.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* Builds command line for running a program via stdbuf.
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*/
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#ifndef BADVPN_STDBUF_CMDLINE_H
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#define BADVPN_STDBUF_CMDLINE_H
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#include <string.h>
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#include <misc/debug.h>
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#include <misc/cmdline.h>
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#include <misc/balloc.h>
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/**
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* Builds the initial part of command line for calling a program via stdbuf
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* with standard output buffering set to line-buffered.
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*
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* @param out {@link CmdLine} to append the result to. Note than on failure, only
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* some part of the cmdline may have been appended.
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* @param stdbuf_exec full path to stdbuf executable
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* @param exec path to the executable. Must not contain nulls.
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* @param exec_len number of characters in exec
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* @return 1 on success, 0 on failure
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*/
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static int build_stdbuf_cmdline (CmdLine *out, const char *stdbuf_exec, const char *exec, size_t exec_len) WARN_UNUSED;
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int build_stdbuf_cmdline (CmdLine *out, const char *stdbuf_exec, const char *exec, size_t exec_len)
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{
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ASSERT(!memchr(exec, '\0', exec_len))
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if (!CmdLine_AppendMulti(out, 3, stdbuf_exec, "-o", "L")) {
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goto fail1;
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}
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if (exec[0] == '/') {
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if (!CmdLine_AppendNoNull(out, exec, exec_len)) {
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goto fail1;
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}
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} else {
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bsize_t size = bsize_add(bsize_fromsize(exec_len), bsize_fromsize(3));
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char *real_exec = BAllocSize(size);
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if (!real_exec) {
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goto fail1;
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}
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memcpy(real_exec, "./", 2);
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memcpy(real_exec + 2, exec, exec_len);
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real_exec[2 + exec_len] = '\0';
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int res = CmdLine_Append(out, real_exec);
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free(real_exec);
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if (!res) {
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goto fail1;
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}
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}
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return 1;
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fail1:
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return 0;
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}
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#endif
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