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|
/*
** ____ _
** ___| _ \ ___ _ __| |
** / _ \ |_) / _ \ '__| |
** | __/ __/ __/ | | |
** \___|_| \___|_| |_|
**
** ePerl -- Embedded Perl 5 Language
**
** ePerl interprets an ASCII file bristled with Perl 5 program statements
** by evaluating the Perl 5 code while passing through the plain ASCII
** data. It can operate both as a standard Unix filter for general file
** generation tasks and as a powerful Webserver scripting language for
** dynamic HTML page programming.
**
** ======================================================================
**
** Copyright (c) 1996,1997,1998,1999 Ralf S. Engelschall <rse@engelschall.com>
**
** This program is free software; it may be redistributed and/or modified
** only under the terms of either the Artistic License or the GNU General
** Public License, which may be found in the ePerl source distribution.
** Look at the files ARTISTIC and COPYING or run ``eperl -l'' to receive
** a built-in copy of both license files.
**
** This program is distributed in the hope that it will be useful, but
** WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See either the
** Artistic License or the GNU General Public License for more details.
**
** ======================================================================
**
** eperl_pp.c -- ePerl preprocessor
*/
#include "eperl_config.h"
#include "eperl_global.h"
#include "eperl_proto.h"
static char ePerl_PP_ErrorString[1024] = "";
/*
** set PP error string
*/
void ePerl_PP_SetError(char *str, ...)
{
va_list ap;
va_start(ap, str);
vsnprintf(ePerl_PP_ErrorString, sizeof(ePerl_PP_ErrorString), str, ap);
ePerl_PP_ErrorString[sizeof(ePerl_PP_ErrorString)-1] = NUL;
va_end(ap);
return;
}
/*
** get PP error string
*/
char *ePerl_PP_GetError(void)
{
return ePerl_PP_ErrorString;
}
/*
** expand #include directives in buffer
*/
char *ePerl_PP_Process(char *cpInput, char **cppINC, int mode)
{
char *cpOutBuf = NULL;
char *cpEND;
char *cps;
char *cp;
char *cp2;
char *cp3;
char *cp4;
char *cpT = NULL;
char *cpInBuf = NULL;
char *cpBuf;
char caName[1024];
char caArg[1024];
char caStr[1024];
int n;
int l1;
int l2;
int nBuf;
int nOut;
int nOutBuf;
int i;
FILE *fp;
if (strlen(cpInput) == 0) {
/* make sure we return a buffer which the caller can free() */
cpOutBuf = (char *)malloc(sizeof(char) * 1);
*cpOutBuf = NUL;
return cpOutBuf;
}
if (mode == 1) {
/* treat input as buffer */
cpBuf = cpInput;
nBuf = strlen(cpBuf);
}
else {
/* treat input as filename */
if (strncmp(cpInput, "http://", 7) == 0) {
fp = HTTP_openURLasFP(cpInput);
}
else if (*cpInput == '/') {
fp = fopen(cpInput, "r");
}
else {
fp = fopen(cpInput, "r");
if (fp == NULL) {
/* we have to try in all include directories! */
for (i = 0; cppINC[i] != NULL; i++) {
snprintf(caName, sizeof(caName), "%s/%s", cppINC[i], cpInput);
caName[sizeof(caName)-1] = NUL;
if ((fp = fopen(caName, "r")) != NULL)
break;
}
}
}
if (fp == NULL) {
ePerl_PP_SetError("Cannot open source file `%s' for reading", cpInput);
return NULL;
}
nBuf = 16384;
if ((cpInBuf = (char *)malloc(sizeof(char) * nBuf)) == NULL) {
ePerl_PP_SetError("Cannot allocate %d bytes of memory", nBuf);
return NULL;
}
i = 0;
while ((n = fread(cpInBuf+i, 1, 16384, fp)) > 0) {
i += n;
if (n < 16384 && feof(fp))
break;
else {
nBuf += 16384;
if ((cpInBuf = (char *)realloc(cpInBuf, nBuf)) == NULL) {
ePerl_PP_SetError("Cannot reallocate %d bytes of memory", nBuf);
return NULL;
}
continue;
}
}
cpInBuf[i] = '\0';
cpBuf = cpInBuf;
nBuf = i;
fclose(fp);
}
cpEND = cpBuf+nBuf;
cps = cpBuf;
nOutBuf = 64;
cpOutBuf = (char *)malloc(64);
nOut = 0;
while (cps < cpEND) {
/*
* search for any more directives
*/
cp = NULL;
if (cps == cpBuf || ((cps > cpBuf) && (*(cps-1) == '\n'))) {
if ((strncmp(cps, "#include", 8) == 0) && (cp == NULL)) cp = cps;
if ((strncmp(cps, "#sinclude", 9) == 0) && (cp == NULL)) cp = cps;
if ((strncmp(cps, "#if", 3) == 0) && (cp == NULL)) cp = cps;
if ((strncmp(cps, "#elsif", 6) == 0) && (cp == NULL)) cp = cps;
if ((strncmp(cps, "#else", 5) == 0) && (cp == NULL)) cp = cps;
if ((strncmp(cps, "#endif", 6) == 0) && (cp == NULL)) cp = cps;
if ((strncmp(cps, "#c", 2) == 0) && (cp == NULL)) cp = cps;
}
if (((cpT = ep_strnstr(cps, "\n#include", cpEND-cps)) != NULL) && ((cpT < cp) || (cp == NULL))) cp = cpT+1;
if (((cpT = ep_strnstr(cps, "\n#sinclude", cpEND-cps)) != NULL) && ((cpT < cp) || (cp == NULL))) cp = cpT+1;
if (((cpT = ep_strnstr(cps, "\n#if", cpEND-cps)) != NULL) && ((cpT < cp) || (cp == NULL))) cp = cpT+1;
if (((cpT = ep_strnstr(cps, "\n#elsif", cpEND-cps)) != NULL) && ((cpT < cp) || (cp == NULL))) cp = cpT+1;
if (((cpT = ep_strnstr(cps, "\n#else", cpEND-cps)) != NULL) && ((cpT < cp) || (cp == NULL))) cp = cpT+1;
if (((cpT = ep_strnstr(cps, "\n#endif", cpEND-cps)) != NULL) && ((cpT < cp) || (cp == NULL))) cp = cpT+1;
if (((cpT = ep_strnstr(cps, "\n#c", cpEND-cps)) != NULL) && ((cpT < cp) || (cp == NULL))) cp = cpT+1;
if (cp != NULL && (cp == cpBuf || (cp > cpBuf && *(cp-1) == '\n'))) {
/*
* Ok, one more directive found...
*/
/* allocate space and add data up to directive */
i = cp-cps;
nOutBuf += i;
if ((cp2 = (char *)realloc(cpOutBuf, nOutBuf)) == NULL) {
ePerl_PP_SetError("Failed on realloc(buf, %d)", nOutBuf);
free(cpOutBuf);
return NULL;
}
cpOutBuf = cp2;
strncpy(cpOutBuf+nOut, cps, cp-cps);
*(cpOutBuf+nOutBuf-1) = NUL;
nOut += i;
/*
* now process the specific directives...
*/
if (strncmp(cp, "#include", 8) == 0) {
/*
* found a #include directive
*/
cps = cp+8;
/* skip whitespaces */
for ( ; cps < cpEND && (*cps == ' ' || *cps == '\t'); cps++)
;
/* skip possible quotation mark or opening angle bracket */
if (*cps == '"' || *cps == '<')
cps++;
/* check for EOL */
if (*cps == '\n') {
ePerl_PP_SetError("Missing filename or URL for #include directive");
free(cpOutBuf);
return NULL;
}
/* copy the filename and skip to end of line */
for (i = 0; cps < cpEND &&
(*cps != ' ' && *cps != '\t' &&
*cps != '>' && *cps != '"' &&
*cps != '\n' ); )
caName[i++] = *cps++;
caName[i++] = NUL;
for ( ; cps < cpEND && *cps != '\n'; cps++)
;
if (*cps == '\n')
cps++;
/* recursive usage */
if ((cp = ePerl_PP_Process(caName, cppINC, 0 /*mode=file*/)) == NULL)
return NULL;
}
else if (strncmp(cp, "#sinclude", 9) == 0) {
/*
* found a #sinclude directive
*/
cps = cp+9;
/* skip whitespaces */
for ( ; cps < cpEND && (*cps == ' ' || *cps == '\t'); cps++)
;
/* skip possible quotation mark or opening angle bracket */
if (*cps == '"' || *cps == '<')
cps++;
/* check for EOL */
if (*cps == '\n') {
ePerl_PP_SetError("Missing filename or URL for #sinclude directive");
free(cpOutBuf);
return NULL;
}
/* copy the filename and skip to end of line */
for (i = 0; i < sizeof(caName) && cps < cpEND &&
(*cps != ' ' && *cps != '\t' &&
*cps != '>' && *cps != '"' &&
*cps != '\n' ); )
caName[i++] = *cps++;
caName[i++] = NUL;
for ( ; cps < cpEND && *cps != '\n'; cps++)
;
if (*cps == '\n')
cps++;
/* recursive usage */
if ((cp = ePerl_PP_Process(caName, cppINC, 0 /*mode=file*/)) == NULL)
return NULL;
/* make it secure by removing all begin/end delimiters!! */
if ((cp2 = (char *)malloc(strlen(cp)*9/8)) == NULL)
return NULL;
l1 = strlen(ePerl_begin_delimiter);
l2 = strlen(ePerl_end_delimiter);
for (cp3 = cp, cp4 = cp2; *cp3 != NUL; ) {
if (strncasecmp(cp3, ePerl_begin_delimiter, l1) == 0)
cp3 += l1;
else if (strncasecmp(cp3, ePerl_end_delimiter, l2) == 0)
cp3 += l2;
else if (strncmp(cp3, "#include", 8) == 0) {
/* Replace all occurences of #include by #sinclude */
strcpy(cp4, "#sinclude");
cp4 += 9;
}
else
*cp4++ = *cp3++;
}
*cp4 = NUL;
free(cp);
cp = cp2;
}
else if (strncmp(cp, "#if", 3) == 0) {
/*
* found a #if directive
*/
cps = cp+3;
/* skip whitespaces */
for ( ; cps < cpEND && (*cps == ' ' || *cps == '\t'); cps++)
;
if (*cps == '\n') {
ePerl_PP_SetError("Missing expression for #if directive");
free(cpOutBuf);
return NULL;
}
/* copy the argument and create replacement string */
for (i = 0; i < sizeof(caArg) && cps < cpEND && *cps != '\n'; )
caArg[i++] = *cps++;
caArg[i++] = NUL;
if (*cps == '\n')
cps++;
snprintf(caStr, sizeof(caStr), "%s if (%s) { _%s//\n",
ePerl_begin_delimiter, caArg, ePerl_end_delimiter);
caStr[sizeof(caStr)-1] = NUL;
cp = caStr;
}
else if (strncmp(cp, "#elsif", 6) == 0) {
/*
* found a #elsif directive
*/
cps = cp+6;
/* skip whitespaces */
for ( ; cps < cpEND && (*cps == ' ' || *cps == '\t'); cps++)
;
if (*cps == '\n') {
ePerl_PP_SetError("Missing expression for #elsif directive");
free(cpOutBuf);
return NULL;
}
/* copy the argument and create replacement string */
for (i = 0; i < sizeof(caArg) && cps < cpEND && *cps != '\n'; )
caArg[i++] = *cps++;
caArg[i++] = NUL;
if (*cps == '\n')
cps++;
snprintf(caStr, sizeof(caStr), "%s } elsif (%s) { _%s//\n",
ePerl_begin_delimiter, caArg, ePerl_end_delimiter);
caStr[sizeof(caStr)-1] = NUL;
cp = caStr;
}
else if (strncmp(cp, "#else", 5) == 0) {
/*
* found a #else directive
*/
cps = cp+5;
/* skip to end of line */
for (i = 0; cps < cpEND && *cps != '\n'; cps++)
;
if (*cps == '\n')
cps++;
/* create replacement string */
snprintf(caStr, sizeof(caStr), "%s } else { _%s//\n",
ePerl_begin_delimiter, ePerl_end_delimiter);
caStr[sizeof(caStr)-1] = NUL;
cp = caStr;
}
else if (strncmp(cp, "#endif", 6) == 0) {
/*
* found a #endif directive
*/
cps = cp+6;
/* skip to end of line */
for (i = 0; cps < cpEND && *cps != '\n'; cps++)
;
if (*cps == '\n')
cps++;
/* create replacement string */
snprintf(caStr, sizeof(caStr), "%s } _%s//\n",
ePerl_begin_delimiter, ePerl_end_delimiter);
caStr[sizeof(caStr)-1] = NUL;
cp = caStr;
}
else if (strncmp(cp, "#c", 2) == 0) {
/*
* found a #c directive
*/
cps = cp+2;
/* skip to end of line */
for (i = 0; cps < cpEND && *cps != '\n'; cps++)
;
if (*cps == '\n')
cps++;
/* create replacement string: just a newline
* to preserve line numbers */
sprintf(caStr, "\n");
cp = caStr;
}
/* allocate space and add replacement data */
i = strlen(cp);
nOutBuf += i;
if ((cp2 = (char *)realloc(cpOutBuf, nOutBuf)) == NULL) {
ePerl_PP_SetError("Failed on realloc(buf, %d)", nOutBuf);
free(cpOutBuf);
return NULL;
}
cpOutBuf = cp2;
strncpy(cpOutBuf+nOut, cp, nOutBuf - nOut);
*(cpOutBuf+nOutBuf-1) = NUL;
nOut += i;
continue;
}
else {
/* no more found */
/* allocate space and add data */
nOutBuf += (cpEND-cps);
if ((cp2 = (char *)realloc(cpOutBuf, nOutBuf)) == NULL) {
ePerl_PP_SetError("Failed on realloc(buf, %d)", nOutBuf);
free(cpOutBuf);
/* XXX free(cp); */
return NULL;
}
cpOutBuf = cp2;
strncpy(cpOutBuf+nOut, cps, nOutBuf - nOut);
*(cpOutBuf+nOutBuf-1) = NUL;
break;
}
}
if (cpInBuf)
free(cpInBuf);
return cpOutBuf;
}
char *ePerl_PP(char *cpBuf, char **cppINC)
{
return ePerl_PP_Process(cpBuf, cppINC, 1 /*mode=buffer*/);
}
/*EOF*/
|
