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ENH: Provide unix-sytle command line parsing

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Add System_Parse_CommandForUnix to the KWSys System interface as a
utility to parse a unix-style command line.  Move the existing
implementation out of ProcessUNIX.  Add a flags argument reserved for
future use in providing additional behavior.
This commit is contained in:
Brad King
2009-07-13 16:22:14 -04:00
parent de6f88d06f
commit 18e639d48a
3 changed files with 303 additions and 256 deletions
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Source/kwsys/ProcessUNIX.c
+3 -256
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@@ -13,11 +13,13 @@
=========================================================================*/
#include "kwsysPrivate.h"
#include KWSYS_HEADER(Process.h)
#include KWSYS_HEADER(System.h)
/* Work-around CMake dependency scanning limitation. This must
duplicate the above list of headers. */
#if 0
# include "Process.h.in"
# include "System.h.in"
#endif
/*
@@ -187,7 +189,6 @@ static void kwsysProcessesSignalHandler(int signum, siginfo_t* info,
#else
static void kwsysProcessesSignalHandler(int signum);
#endif
static char** kwsysProcessParseVerbatimCommand(const char* command);
/*--------------------------------------------------------------------------*/
/* Structure containing data used to implement the child's execution. */
@@ -422,7 +423,7 @@ int kwsysProcess_AddCommand(kwsysProcess* cp, char const* const* command)
/* In order to run the given command line verbatim we need to
parse it. */
newCommands[cp->NumberOfCommands] =
kwsysProcessParseVerbatimCommand(*command);
kwsysSystem_Parse_CommandForUnix(*command, 0);
if(!newCommands[cp->NumberOfCommands])
{
/* Out of memory. */
@@ -2729,257 +2730,3 @@ static void kwsysProcessesSignalHandler(int signum
}
#endif
}
/*--------------------------------------------------------------------------*/
static int kwsysProcessAppendByte(char* local,
char** begin, char** end,
int* size, char c)
{
/* Allocate space for the character. */
if((*end - *begin) >= *size)
{
kwsysProcess_ptrdiff_t length = *end - *begin;
char* newBuffer = (char*)malloc((size_t)(*size*2));
if(!newBuffer)
{
return 0;
}
memcpy(newBuffer, *begin, (size_t)(length)*sizeof(char));
if(*begin != local)
{
free(*begin);
}
*begin = newBuffer;
*end = *begin + length;
*size *= 2;
}
/* Store the character. */
*(*end)++ = c;
return 1;
}
/*--------------------------------------------------------------------------*/
static int kwsysProcessAppendArgument(char** local,
char*** begin, char*** end,
int* size,
char* arg_local,
char** arg_begin, char** arg_end,
int* arg_size)
{
/* Append a null-terminator to the argument string. */
if(!kwsysProcessAppendByte(arg_local, arg_begin, arg_end, arg_size, '\0'))
{
return 0;
}
/* Allocate space for the argument pointer. */
if((*end - *begin) >= *size)
{
kwsysProcess_ptrdiff_t length = *end - *begin;
char** newPointers = (char**)malloc((size_t)(*size)*2*sizeof(char*));
if(!newPointers)
{
return 0;
}
memcpy(newPointers, *begin, (size_t)(length)*sizeof(char*));
if(*begin != local)
{
free(*begin);
}
*begin = newPointers;
*end = *begin + length;
*size *= 2;
}
/* Allocate space for the argument string. */
**end = (char*)malloc((size_t)(*arg_end - *arg_begin));
if(!**end)
{
return 0;
}
/* Store the argument in the command array. */
memcpy(**end, *arg_begin,(size_t)(*arg_end - *arg_begin));
++(*end);
/* Reset the argument to be empty. */
*arg_end = *arg_begin;
return 1;
}
/*--------------------------------------------------------------------------*/
#define KWSYSPE_LOCAL_BYTE_COUNT 1024
#define KWSYSPE_LOCAL_ARGS_COUNT 32
static char** kwsysProcessParseVerbatimCommand(const char* command)
{
/* Create a buffer for argument pointers during parsing. */
char* local_pointers[KWSYSPE_LOCAL_ARGS_COUNT];
int pointers_size = KWSYSPE_LOCAL_ARGS_COUNT;
char** pointer_begin = local_pointers;
char** pointer_end = pointer_begin;
/* Create a buffer for argument strings during parsing. */
char local_buffer[KWSYSPE_LOCAL_BYTE_COUNT];
int buffer_size = KWSYSPE_LOCAL_BYTE_COUNT;
char* buffer_begin = local_buffer;
char* buffer_end = buffer_begin;
/* Parse the command string. Try to behave like a UNIX shell. */
char** newCommand = 0;
const char* c = command;
int in_argument = 0;
int in_escape = 0;
int in_single = 0;
int in_double = 0;
int failed = 0;
for(;*c; ++c)
{
if(in_escape)
{
/* This character is escaped so do no special handling. */
if(!in_argument)
{
in_argument = 1;
}
if(!kwsysProcessAppendByte(local_buffer, &buffer_begin,
&buffer_end, &buffer_size, *c))
{
failed = 1;
break;
}
in_escape = 0;
}
else if(*c == '\\' && !in_single)
{
/* The next character should be escaped. */
in_escape = 1;
}
else if(*c == '\'' && !in_double)
{
/* Enter or exit single-quote state. */
if(in_single)
{
in_single = 0;
}
else
{
in_single = 1;
if(!in_argument)
{
in_argument = 1;
}
}
}
else if(*c == '"' && !in_single)
{
/* Enter or exit double-quote state. */
if(in_double)
{
in_double = 0;
}
else
{
in_double = 1;
if(!in_argument)
{
in_argument = 1;
}
}
}
else if(isspace((unsigned char) *c))
{
if(in_argument)
{
if(in_single || in_double)
{
/* This space belongs to a quoted argument. */
if(!kwsysProcessAppendByte(local_buffer, &buffer_begin,
&buffer_end, &buffer_size, *c))
{
failed = 1;
break;
}
}
else
{
/* This argument has been terminated by whitespace. */
if(!kwsysProcessAppendArgument(local_pointers, &pointer_begin,
&pointer_end, &pointers_size,
local_buffer, &buffer_begin,
&buffer_end, &buffer_size))
{
failed = 1;
break;
}
in_argument = 0;
}
}
}
else
{
/* This character belong to an argument. */
if(!in_argument)
{
in_argument = 1;
}
if(!kwsysProcessAppendByte(local_buffer, &buffer_begin,
&buffer_end, &buffer_size, *c))
{
failed = 1;
break;
}
}
}
/* Finish the last argument. */
if(in_argument)
{
if(!kwsysProcessAppendArgument(local_pointers, &pointer_begin,
&pointer_end, &pointers_size,
local_buffer, &buffer_begin,
&buffer_end, &buffer_size))
{
failed = 1;
}
}
/* If we still have memory allocate space for the new command
buffer. */
if(!failed)
{
kwsysProcess_ptrdiff_t n = pointer_end - pointer_begin;
newCommand = (char**)malloc((size_t)(n+1)*sizeof(char*));
}
if(newCommand)
{
/* Copy the arguments into the new command buffer. */
kwsysProcess_ptrdiff_t n = pointer_end - pointer_begin;
memcpy(newCommand, pointer_begin, sizeof(char*)*(size_t)(n));
newCommand[n] = 0;
}
else
{
/* Free arguments already allocated. */
while(pointer_end != pointer_begin)
{
free(*(--pointer_end));
}
}
/* Free temporary buffers. */
if(pointer_begin != local_pointers)
{
free(pointer_begin);
}
if(buffer_begin != local_buffer)
{
free(buffer_begin);
}
/* Return the final command buffer. */
return newCommand;
}