tor-android/external/badvpn_dns/misc/stdbuf_cmdline.h

93 lines
3.3 KiB
C

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