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/* SPDX-License-Identifier: Artistic-1.0-Perl OR GPL-2.0-only
** Copyright (c) 1996,1997,1998 Ralf S. Engelschall <rse@engelschall.com>
*/
#include "eperl.h"
enum ppmode { ppmode_file, ppmode_buffer };
struct span { char *str; size_t len; };
/*
** expand #include directives in buffer
*/
static struct span ePerl_PP_Process(char *cpInput, const char *const *cppINC, size_t cppINCLen, enum ppmode mode, const char *ePerl_begin_delimiter, const char *ePerl_end_delimiter, bool ePerl_case_sensitive_delimiters)
{
char *cp;
char *cpT = NULL;
char *cpInBuf = NULL;
char *cpBuf;
size_t nBuf;
if (*cpInput == '\0')
return (struct span){strdup(""), 0};
if (mode == ppmode_buffer) {
/* treat input as buffer */
cpBuf = cpInput;
nBuf = strlen(cpBuf);
}
else {
/* treat input as filename */
FILE *fp;
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! */
char *full = NULL;
for (size_t i = 0; i != cppINCLen; ++i) {
free(full);
if (asprintf(&full, "%s/%s", cppINC[i], cpInput) == -1)
break;
if ((fp = fopen(full, "r")) != NULL)
break;
}
free(full);
}
}
if (fp == NULL) {
ePerl_SetError("Cannot open source file %s for reading", cpInput);
return (struct span){};
}
FILE *Buf = open_memstream(&cpBuf, &nBuf);
if (!ePerl_CopyFILE(fp, Buf)) {
ePerl_SetError("Cannot read from file %s", cpInput);
return (struct span){};
}
fclose(fp);
fclose(Buf);
cpInBuf = cpBuf;
}
char *cpEND = cpBuf+nBuf;
char *cps = cpBuf;
struct span ret;
FILE *OutBuf = open_memstream(&ret.str, &ret.len);
while (cps < cpEND) {
/*
* search for any more directives
*/
cp = NULL;
if (cps == cpBuf || ((cps > cpBuf) && (*(cps-1) == '\n'))) {
if ((strncmp(cps, "#include", sizeof("#include") - 1) == 0) && (cp == NULL)) cp = cps;
if ((strncmp(cps, "#sinclude", sizeof("#sinclude") - 1) == 0) && (cp == NULL)) cp = cps;
if ((strncmp(cps, "#if", sizeof("#if") - 1) == 0) && (cp == NULL)) cp = cps;
if ((strncmp(cps, "#elsif", sizeof("#elsif") - 1) == 0) && (cp == NULL)) cp = cps;
if ((strncmp(cps, "#else", sizeof("#else") - 1) == 0) && (cp == NULL)) cp = cps;
if ((strncmp(cps, "#endif", sizeof("#endif") - 1) == 0) && (cp == NULL)) cp = cps;
if ((strncmp(cps, "#c", sizeof("#c") - 1) == 0) && (cp == NULL)) cp = cps;
}
if (((cpT = memmem(cps, cpEND-cps, "\n#include", sizeof("\n#include") - 1)) != NULL) && ((cpT < cp) || (cp == NULL))) cp = cpT+1;
if (((cpT = memmem(cps, cpEND-cps, "\n#sinclude", sizeof("\n#sinclude") - 1)) != NULL) && ((cpT < cp) || (cp == NULL))) cp = cpT+1;
if (((cpT = memmem(cps, cpEND-cps, "\n#if", sizeof("\n#if") - 1)) != NULL) && ((cpT < cp) || (cp == NULL))) cp = cpT+1;
if (((cpT = memmem(cps, cpEND-cps, "\n#elsif", sizeof("\n#elsif") - 1)) != NULL) && ((cpT < cp) || (cp == NULL))) cp = cpT+1;
if (((cpT = memmem(cps, cpEND-cps, "\n#else", sizeof("\n#else") - 1)) != NULL) && ((cpT < cp) || (cp == NULL))) cp = cpT+1;
if (((cpT = memmem(cps, cpEND-cps, "\n#endif", sizeof("\n#endif") - 1)) != NULL) && ((cpT < cp) || (cp == NULL))) cp = cpT+1;
if (((cpT = memmem(cps, cpEND-cps, "\n#c", sizeof("\n#c") - 1)) != NULL) && ((cpT < cp) || (cp == NULL))) cp = cpT+1;
if (cp != NULL && (cp == cpBuf || (cp > cpBuf && *(cp-1) == '\n'))) {
/* copy data up to directive */
fwrite(cps, 1, cp-cps, OutBuf);
/*
* now process the specific directives...
*/
if (strncmp(cp, "#include", 8) == 0 || strncmp(cp, "#sinclude", 8) == 0) {
bool sinclude = cp[1] == 's';
cps = cp + 8 + sinclude;
/* skip whitespace */
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_SetError("Missing filename or URL for #%.*sinclude directive", sinclude, "s");
goto CUS;
}
/* grab the filename, skip to end of line later */
char *caName = cps;
while ( cps < cpEND &&
(*cps != ' ' && *cps != '\t' &&
*cps != '>' && *cps != '"' &&
*cps != '\n' ))
++cps;
char orig = *cps;
*cps = '\0';
/* recursive usage */
struct span loaded = ePerl_PP_Process(caName, cppINC, cppINCLen, ppmode_file, ePerl_begin_delimiter, ePerl_end_delimiter, ePerl_case_sensitive_delimiters);
*cps = orig;
if (!loaded.str)
goto CUS;
if (sinclude) {
/* make it secure by removing all begin/end delimiters!! */
#define KILLDEL(delimiter) \
size_t delimiter##_len = strlen(delimiter); \
for (char *del; (del = (ePerl_case_sensitive_delimiters ? memmem : memcasemem)(loaded.str, loaded.len, delimiter, delimiter##_len));) { \
memmove(del, del + delimiter##_len, loaded.len - (del + delimiter##_len - loaded.str)); \
loaded.len -= delimiter##_len; \
}
KILLDEL(ePerl_begin_delimiter)
KILLDEL(ePerl_end_delimiter)
}
fwrite(loaded.str, 1, loaded.len, OutBuf);
free(loaded.str);
}
else if (strncmp(cp, "#if", 3) == 0 || strncmp(cp, "#elsif", 6) == 0) {
bool elsif = cp[1] == 'e';
cps = cp + (elsif ? 6 : 3);
/* skip whitespaces */
for ( ; cps < cpEND && (*cps == ' ' || *cps == '\t'); cps++)
;
if (*cps == '\n') {
ePerl_SetError("Missing expression for #%sif directive", elsif ? "els" : "");
goto CUS;
}
/* copy the argument and create replacement string */
char *argstart = cps;
while (*cps && *cps != '\n')
++cps;
char orig = *cps;
*cps = '\0';
fprintf(OutBuf, "%s %sif (%s) { _%s//\n",
ePerl_begin_delimiter, elsif ? "} els" : "", argstart, ePerl_end_delimiter);
*cps = orig;
}
else if (strncmp(cp, "#else", 5) == 0) {
cps = cp+5;
fprintf(OutBuf, "%s } else { _%s//\n",
ePerl_begin_delimiter, ePerl_end_delimiter);
}
else if (strncmp(cp, "#endif", 6) == 0) {
cps = cp+6;
fprintf(OutBuf, "%s } _%s//\n",
ePerl_begin_delimiter, ePerl_end_delimiter);
}
else if (strncmp(cp, "#c", 2) == 0) {
cps = cp+2;
/* completely discard line */
}
/* skip to end of line */
for ( ; cps < cpEND && *cps != '\n'; cps++)
;
if (*cps == '\n')
cps++;
}
else {
/* no more found */
/* add data */
fputs(cps, OutBuf);
break;
}
}
if (fclose(OutBuf))
goto CUS2;
ret:
if (cpInBuf)
free(cpInBuf);
return ret;
CUS:
fclose(OutBuf);
CUS2:
free(ret.str);
ret = (struct span){};
goto ret;
}
char *ePerl_PP(char *cpBuf, const char *const *cppINC, size_t cppINCLen, const char *ePerl_begin_delimiter, const char *ePerl_end_delimiter, bool ePerl_case_sensitive_delimiters)
{
return ePerl_PP_Process(cpBuf, cppINC, cppINCLen, ppmode_buffer, ePerl_begin_delimiter, ePerl_end_delimiter, ePerl_case_sensitive_delimiters).str;
}
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