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#include <stdio.h> /* for printf */
#include <stdlib.h> /* malloc, free */
#include <string.h> /* memmove */
#include "header.h"
#define HEAD 2*sizeof(int)
#define EXTENDER 40
/* This modules provides a simple mechanism for arbitrary length writable
strings, called 'blocks'. They are 'symbol *' items rather than 'char *'
items however.
The calls are:
symbol * b = create_b(n);
- create an empty block b with room for n symbols
b = increase_capacity(b, n);
- increase the capacity of block b by n symbols (b may change)
b2 = copy_b(b)
- copy block b into b2
lose_b(b);
- lose block b
b = move_to_b(b, n, p);
- set the data in b to be the n symbols at address p
b = add_to_b(b, n, p);
- add the n symbols at address p to the end of the data in b
SIZE(b)
- is the number of symbols in b
For example:
symbol * b = create_b(0);
{ int i;
char p[10];
for (i = 0; i < 100; i++) {
sprintf(p, " %d", i);
add_s_to_b(b, p);
}
}
and b contains " 0 1 2 ... 99" spaced out as symbols.
*/
/* For a block b, SIZE(b) is the number of symbols so far written into it,
CAPACITY(b) the total number it can contain, so SIZE(b) <= CAPACITY(b).
In fact blocks have 1 extra character over the promised capacity so
they can be zero terminated by 'b[SIZE(b)] = 0;' without fear of
overwriting.
*/
extern symbol * create_b(int n) {
symbol * p = (symbol *) (HEAD + (char *) MALLOC(HEAD + (n + 1) * sizeof(symbol)));
CAPACITY(p) = n;
SIZE(p) = 0;
return p;
}
extern void report_b(FILE * out, symbol * p) {
int i;
for (i = 0; i < SIZE(p); i++) fprintf(out, "%c", p[i]);
}
extern void lose_b(symbol * p) {
if (p == 0) return;
FREE((char *) p - HEAD);
}
extern symbol * increase_capacity(symbol * p, int n) {
symbol * q = create_b(CAPACITY(p) + n + EXTENDER);
memmove(q, p, CAPACITY(p) * sizeof(symbol));
SIZE(q) = SIZE(p);
lose_b(p); return q;
}
extern symbol * move_to_b(symbol * p, int n, symbol * q) {
int x = n - CAPACITY(p);
if (x > 0) p = increase_capacity(p, x);
memmove(p, q, n * sizeof(symbol)); SIZE(p) = n; return p;
}
extern symbol * add_to_b(symbol * p, int n, symbol * q) {
int x = SIZE(p) + n - CAPACITY(p);
if (x > 0) p = increase_capacity(p, x);
memmove(p + SIZE(p), q, n * sizeof(symbol)); SIZE(p) += n; return p;
}
extern symbol * copy_b(symbol * p) {
int n = SIZE(p);
symbol * q = create_b(n);
move_to_b(q, n, p);
return q;
}
int space_count = 0;
extern void * check_malloc(int n) {
space_count++;
return calloc(1, n);
}
extern void check_free(void * p) {
space_count--;
free(p);
}
/* To convert a block to a zero terminated string: */
extern char * b_to_s(symbol * p) {
int n = SIZE(p);
char * s = (char *)calloc(1, n + 1);
{
int i;
for (i = 0; i < n; i++) {
if (p[i] > 255) {
printf("In b_to_s, can't convert p[%d] to char because it's 0x%02x\n", i, (int)p[i]);
exit(1);
}
s[i] = (char)p[i];
}
}
s[n] = 0;
return s;
}
/* To add a zero terminated string to a block. If p = 0 the
block is created. */
extern symbol * add_s_to_b(symbol * p, const char * s) {
int n = strlen(s);
int k;
if (p == 0) p = create_b(n);
k = SIZE(p);
{
int x = k + n - CAPACITY(p);
if (x > 0) p = increase_capacity(p, x);
}
{
int i;
for (i = 0; i < n; i++) p[i + k] = s[i];
}
SIZE(p) += n;
return p;
}
/* The next section defines string handling capabilities in terms
of the lower level block handling capabilities of space.c */
/* -------------------------------------------------------------*/
struct str {
symbol * data;
};
/* Create a new string. */
extern struct str * str_new() {
struct str * output = (struct str *) calloc(1, sizeof(struct str));
output->data = create_b(0);
return output;
}
/* Delete a string. */
extern void str_delete(struct str * str) {
lose_b(str->data);
free(str);
}
/* Append a str to this str. */
extern void str_append(struct str * str, struct str * add) {
symbol * q = add->data;
str->data = add_to_b(str->data, SIZE(q), q);
}
/* Append a character to this str. */
extern void str_append_ch(struct str * str, char add) {
symbol q[1];
q[0] = add;
str->data = add_to_b(str->data, 1, q);
}
/* Append a low level block to a str. */
extern void str_append_b(struct str * str, symbol * q) {
str->data = add_to_b(str->data, SIZE(q), q);
}
/* Append a (char *, null teminated) string to a str. */
extern void str_append_string(struct str * str, const char * s) {
str->data = add_s_to_b(str->data, s);
}
/* Append an integer to a str. */
extern void str_append_int(struct str * str, int i) {
char s[30];
sprintf(s, "%d", i);
str_append_string(str, s);
}
/* Clear a string */
extern void str_clear(struct str * str) {
SIZE(str->data) = 0;
}
/* Set a string */
extern void str_assign(struct str * str, char * s) {
str_clear(str);
str_append_string(str, s);
}
/* Copy a string. */
extern struct str * str_copy(struct str * old) {
struct str * newstr = str_new();
str_append(newstr, old);
return newstr;
}
/* Get the data stored in this str. */
extern symbol * str_data(struct str * str) {
return str->data;
}
/* Get the length of the str. */
extern int str_len(struct str * str) {
return SIZE(str->data);
}
extern int get_utf8(const symbol * p, int * slot) {
int b0, b1;
b0 = *p++;
if (b0 < 0xC0) { /* 1100 0000 */
* slot = b0; return 1;
}
b1 = *p++;
if (b0 < 0xE0) { /* 1110 0000 */
* slot = (b0 & 0x1F) << 6 | (b1 & 0x3F); return 2;
}
* slot = (b0 & 0xF) << 12 | (b1 & 0x3F) << 6 | (*p & 0x3F); return 3;
}
extern int put_utf8(int ch, symbol * p) {
if (ch < 0x80) {
p[0] = ch; return 1;
}
if (ch < 0x800) {
p[0] = (ch >> 6) | 0xC0;
p[1] = (ch & 0x3F) | 0x80; return 2;
}
p[0] = (ch >> 12) | 0xE0;
p[1] = ((ch >> 6) & 0x3F) | 0x80;
p[2] = (ch & 0x3F) | 0x80; return 3;
}
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