1 files changed, 287 insertions, 0 deletions
diff --git a/contrib/snowball/compiler/space.c b/contrib/snowball/compiler/space.c
new file mode 100644
index 0000000..5b05876
--- /dev/null
+++ b/contrib/snowball/compiler/space.c
@@ -0,0 +1,287 @@
+
+#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, const symbol * p) {
+    int i;
+    for (i = 0; i < SIZE(p); i++) {
+        if (p[i] > 255) {
+            printf("In report_b, can't convert p[%d] to char because it's 0x%02x\n", i, (int)p[i]);
+            exit(1);
+        }
+        putc(p[i], out);
+    }
+}
+
+extern void output_str(FILE * outfile, struct str * str) {
+    report_b(outfile, str_data(str));
+}
+
+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, const 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, const 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(const 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 malloc(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(const symbol * p) {
+    int n = SIZE(p);
+    char * s = (char *)malloc(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(void) {
+
+    struct str * output = (struct str *) malloc(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, const 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, const symbol * q) {
+
+    str->data = add_to_b(str->data, SIZE(q), q);
+}
+
+/* Append the tail of a low level block to a str. */
+extern void str_append_b_tail(struct str * str, const symbol * q, int skip) {
+    if (skip < 0 || skip >= SIZE(q)) return;
+
+    str->data = add_to_b(str->data, SIZE(q) - skip, q + skip);
+}
+
+/* Append a (char *, null terminated) 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, const char * s) {
+
+    str_clear(str);
+    str_append_string(str, s);
+}
+
+/* Copy a string. */
+extern struct str * str_copy(const 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(const struct str * str) {
+
+    return str->data;
+}
+
+/* Get the length of the str. */
+extern int str_len(const struct str * str) {
+
+    return SIZE(str->data);
+}
+
+/* Get the last character of the str.
+ *
+ * Or -1 if the string is empty.
+ */
+extern int str_back(const struct str *str) {
+    return SIZE(str->data) ? str->data[SIZE(str->data) - 1] : -1;
+}
+
+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;
+}