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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "regis.h"
#include "common.h"
int
RS_isRegis(const char *str)
{
unsigned char *ptr = (unsigned char *) str;
while (ptr && *ptr)
if (isalpha(*ptr) || *ptr == '[' || *ptr == ']' || *ptr == '^')
ptr++;
else
return 0;
return 1;
}
#define RS_IN_ONEOF 1
#define RS_IN_ONEOF_IN 2
#define RS_IN_NONEOF 3
#define RS_IN_WAIT 4
static RegisNode *
newRegisNode(RegisNode * prev, int len)
{
RegisNode *ptr;
ptr = (RegisNode *) malloc(RNHDRSZ + len + 1);
if (!ptr)
ts_error(ERROR, "No memory");
memset(ptr, 0, RNHDRSZ + len + 1);
if (prev)
prev->next = ptr;
return ptr;
}
int
RS_compile(Regis * r, int issuffix, const char *str)
{
int i,
len = strlen(str);
int state = RS_IN_WAIT;
RegisNode *ptr = NULL;
memset(r, 0, sizeof(Regis));
r->issuffix = (issuffix) ? 1 : 0;
for (i = 0; i < len; i++)
{
unsigned char c = *(((unsigned char *) str) + i);
if (state == RS_IN_WAIT)
{
if (isalpha(c))
{
if (ptr)
ptr = newRegisNode(ptr, len);
else
ptr = r->node = newRegisNode(NULL, len);
ptr->data[0] = c;
ptr->type = RSF_ONEOF;
ptr->len = 1;
}
else if (c == '[')
{
if (ptr)
ptr = newRegisNode(ptr, len);
else
ptr = r->node = newRegisNode(NULL, len);
ptr->type = RSF_ONEOF;
state = RS_IN_ONEOF;
}
else
ts_error(ERROR, "Error in regis: %s at pos %d\n", str, i + 1);
}
else if (state == RS_IN_ONEOF)
{
if (c == '^')
{
ptr->type = RSF_NONEOF;
state = RS_IN_NONEOF;
}
else if (isalpha(c))
{
ptr->data[0] = c;
ptr->len = 1;
state = RS_IN_ONEOF_IN;
}
else
ts_error(ERROR, "Error in regis: %s at pos %d\n", str, i + 1);
}
else if (state == RS_IN_ONEOF_IN || state == RS_IN_NONEOF)
{
if (isalpha(c))
{
ptr->data[ptr->len] = c;
ptr->len++;
}
else if (c == ']')
state = RS_IN_WAIT;
else
ts_error(ERROR, "Error in regis: %s at pos %d\n", str, i + 1);
}
else
ts_error(ERROR, "Internal error in RS_compile: %d\n", state);
}
ptr = r->node;
while (ptr)
{
r->nchar++;
ptr = ptr->next;
}
return 0;
}
void
RS_free(Regis * r)
{
RegisNode *ptr = r->node,
*tmp;
while (ptr)
{
tmp = ptr->next;
free(ptr);
ptr = tmp;
}
r->node = NULL;
}
int
RS_execute(Regis * r, const char *str, int len)
{
RegisNode *ptr = r->node;
unsigned char *c;
if (len < 0)
len = strlen(str);
if (len < r->nchar)
return 0;
if (r->issuffix)
c = ((unsigned char *) str) + len - r->nchar;
else
c = (unsigned char *) str;
while (ptr)
{
switch (ptr->type)
{
case RSF_ONEOF:
if (ptr->len == 0)
{
if (*c != *(ptr->data))
return 0;
}
else if (strchr((char *) ptr->data, *c) == NULL)
return 0;
break;
case RSF_NONEOF:
if (ptr->len == 0)
{
if (*c == *(ptr->data))
return 0;
}
else if (strchr((char *) ptr->data, *c) != NULL)
return 0;
break;
default:
ts_error(ERROR, "RS_execute: Unknown type node: %d\n", ptr->type);
}
ptr = ptr->next;
c++;
}
return 1;
}
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