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// Institute of Microbiology (Technical University Munich) //
// http://www.arb-home.de/ //
#include "aisc_eval.h"
#include "aisc_inline.h"
#include "aisc_proto.h"
char *Expression::eval_math(char *expr, char op_char) {
char sep[] = "?,;";
sep[0] = op_char;
char *brk = strpbrk(expr, sep);
if (!brk) {
print_error(&loc, formatted("Expected to see '%c', ',' or ';' in '%s'", op_char, expr));
return NULL;
}
brk[0] = 0;
int i1 = atoi(expr);
brk[0] = op_char;
int i2 = atoi(brk+1);
int r;
switch (op_char) {
case '+': r = i1+i2; break;
case '*': r = i1*i2; break;
default :
printf_error(&loc, "Unknown operator '%c'", op_char);
return NULL;
}
return strdup(formatted("%i", r));
}
char *Expression::evalPart(int start, int end, int& resLen) {
aisc_assert(start>0);
char *res = NULL;
resLen = -1;
char c = ebuffer[end+1];
ebuffer[end+1] = 0;
char *part = ebuffer+start;
SKIP_SPACE_LF(part);
if (start>end) { // empty "$()"
res = strdup("");
resLen = 0;
}
else if (part[0] == '+' || part[0] == '*') {
res = eval_math(part+1, part[0]);
}
else if (part[0] == '#') {
if (strncmp(part, "#FILE", 5) == 0) {
char *path = part+5;
while (is_SPACE_LF_EOS(*path)) ++path;
char *file = read_aisc_file(path, &loc);
if (!file) {
printf_error(&loc, "couldn't read file '%s'", path);
}
else {
int fileLen = strlen(file);
const char *sourcename = loc.get_path();
int sourceline = loc.get_linenr();
aisc_assert(sourcename);
int buflen = fileLen+strlen(path)+strlen(sourcename)+100;
res = (char *)malloc(buflen+1);
// Inject code to restore correct code file and line (needed for proper error messages)
int printed = sprintf(res, "@SETSOURCE %s,%i@%s@SETSOURCE %s,%i@",
path, 1,
file,
sourcename, sourceline);
if (printed >= buflen) {
fprintf(stderr, "%s:%i: Error: buffer overflow\n", __FILE__, __LINE__);
}
free(file);
}
}
else {
printf_error(&loc, "unknown eval-command '%s'", part);
}
}
else {
res = get_var_string(data, part, allow_missing_ref);
}
ebuffer[end+1] = c;
if (resLen == -1 && res) resLen = strlen(res);
return res;
}
bool Expression::evalRest(const int offset) {
// evaluate content of 'ebuffer' starting at offset
// return true on success
// may reallocate ebuffer - so old pointers might get invalidated
aisc_assert(strncmp(ebuffer+offset, "$(", 2) == 0);
{
const char *more_to_eval = strstr(ebuffer+offset+2, "$(");
if (more_to_eval) {
if (!evalRest(more_to_eval-ebuffer)) return false;
}
}
int closing_paren;
{
const char *paren = strchr(ebuffer+offset+2, ')');
if (!paren) {
print_error(&loc, "unbalanced parens; missing ')'");
return false;
}
closing_paren = paren-ebuffer;
}
int eval_len;
char *evaluated;
if (offset>0 && ebuffer[offset-1] == '$') { // quoted "$$(...)"
eval_len = closing_paren-offset;
evaluated = strduplen(ebuffer+offset+1, eval_len);
}
else {
evaluated = evalPart(offset+2, closing_paren-1, eval_len);
}
if (!evaluated) {
return false;
}
int org_len = closing_paren-offset+1;
char *rest = ebuffer+closing_paren+1;
int restlen = used-closing_paren;
if (eval_len <= org_len) {
if (eval_len < org_len) {
aisc_assert(closing_paren+1 <= used);
memmove(ebuffer+offset+eval_len, rest, restlen);
used -= (org_len-eval_len);
}
memcpy(ebuffer+offset, evaluated, eval_len);
}
else {
int growth = eval_len-org_len;
if ((used+growth+1)>bufsize) { // need to increase ebuffer size
int new_bufsize = (used+growth+1)*3/2;
char *new_linebuf = (char*)malloc(new_bufsize);
memcpy(new_linebuf, ebuffer, offset);
memcpy(new_linebuf+offset, evaluated, eval_len);
aisc_assert(closing_paren+1 <= used);
memcpy(new_linebuf+offset+eval_len, rest, restlen);
free(ebuffer);
ebuffer = new_linebuf;
bufsize = new_bufsize;
}
else {
aisc_assert(closing_paren+1 <= used);
memmove(ebuffer+offset+eval_len, rest, restlen);
memcpy(ebuffer+offset, evaluated, eval_len);
}
used += growth;
aisc_assert(used<bufsize);
}
aisc_assert(ebuffer[used] == 0);
free(evaluated);
char *ld = strstr(ebuffer+offset, "$(");
if (ld) {
int next_offset = ld-ebuffer;
if (next_offset == offset) { // infinite loop in evaluation
static int deadlock_offset;
static int deadlock_count;
if (next_offset == deadlock_offset) {
++deadlock_count;
if (deadlock_count > 50) { // more than 50 evals at same offset in expression
printf_error(&loc, "detected (endless?) recursive evaluation in expression '%s'", ld);
return false;
}
}
else {
deadlock_offset = next_offset;
deadlock_count = 1;
}
}
return evalRest(next_offset);
}
return true;
}
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