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argvsplit: refactor splitting state machine

feature/tap-sh
William Pitcock 2017-02-25 15:04:08 -06:00
parent a3fa9732b3
commit ae42261c3f
1 changed files with 42 additions and 43 deletions
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85
libpkgconf/argvsplit.c
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@ -2,7 +2,7 @@
* argvsplit.c
* argv_split() routine
*
* Copyright (c) 2012 pkgconf authors (see AUTHORS).
* Copyright (c) 2012, 2017 pkgconf authors (see AUTHORS).
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
@ -64,7 +64,7 @@ pkgconf_argv_split(const char *src, int *argc, char ***argv)
int argc_count = 0;
int argv_size = 5;
char quote = 0;
bool in_single_quotes = false;
bool escaped = false;
src_iter = src;
dst_iter = buf;
@ -76,24 +76,32 @@ pkgconf_argv_split(const char *src, int *argc, char ***argv)
while (*src_iter)
{
if (quote == *src_iter)
quote = 0;
if (escaped)
{
/* POSIX: only \CHAR is special inside a double quote if CHAR is {$, `, ", \, newline}. */
if (quote == '\"')
{
if (!(*src_iter == '$' || *src_iter == '`' || *src_iter == '"' || *src_iter == '\\'))
*dst_iter++ = '\\';
*dst_iter++ = *src_iter;
}
else
{
if (!isspace((unsigned int) *src_iter))
*dst_iter++ = *src_iter;
}
escaped = false;
}
else if (quote)
{
if (*src_iter == '\\')
{
src_iter++;
if (!*src_iter)
{
free(*argv);
free(buf);
return -1;
}
if (*src_iter != quote)
*dst_iter++ = '\\';
}
*dst_iter++ = *src_iter;
if (*src_iter == quote)
quote = 0;
else if (*src_iter == '\\')
escaped = true;
else
*dst_iter++ = *src_iter;
}
else if (isspace((unsigned int)*src_iter))
{
@ -112,32 +120,15 @@ pkgconf_argv_split(const char *src, int *argc, char ***argv)
}
else switch(*src_iter)
{
case '\"':
if (in_single_quotes)
*dst_iter++ = *src_iter;
break;
case '\'':
in_single_quotes ^= true;
*dst_iter++ = *src_iter;
break;
case '\\':
src_iter++;
if (!*src_iter)
{
free(argv);
free(buf);
return -1;
}
else
{
*dst_iter++ = '\\';
*dst_iter++ = *src_iter;
}
escaped = true;
break;
case '\"':
case '\'':
quote = *src_iter;
break;
default:
*dst_iter++ = *src_iter;
break;
@ -146,7 +137,15 @@ pkgconf_argv_split(const char *src, int *argc, char ***argv)
src_iter++;
}
if (strlen((*argv)[argc_count])) {
if (escaped || quote)
{
free(*argv);
free(buf);
return -1;
}
if (strlen((*argv)[argc_count]))
{
argc_count++;
}