--- /dev/null
+/*
+ * Copyright (C) 1994, Index Data I/S
+ * All rights reserved.
+ * Sebastian Hammer, Adam Dickmeiss
+ *
+ * $Log: charmap.c,v $
+ * Revision 1.1 1996-05-31 09:07:18 quinn
+ * Work on character-set handling
+ *
+ *
+ */
+
+/*
+ * Support module to handle character-conversions into and out of the
+ * Zebra dictionary.
+ */
+
+#include <ctype.h>
+
+#include <alexutil.h>
+#include <yaz-util.h>
+#include <charmap.h>
+#include <tpath.h>
+
+const char *CHR_UNKNOWN = "\001";
+const char *CHR_SPACE = "\002";
+const char *CHR_BASE = "\003";
+
+extern char *data1_tabpath;
+
+/*
+ * Character map trie node.
+ */
+struct chr_t_entry
+{
+ chr_t_entry **children; /* array of children */
+ unsigned char *target; /* target for this node, if any */
+ unsigned char *equiv; /* equivalent to, or sumthin */
+} t_entry;
+
+/*
+ * Add an entry to the character map.
+ */
+static chr_t_entry *set_map_string(chr_t_entry *root, char *from, int len,
+ char *to)
+{
+ if (!root)
+ {
+ root = xmalloc(sizeof(*root));
+ root->children = 0;
+ root->target = 0;
+ }
+ if (!len)
+ root->target = (unsigned char *) xstrdup(to);
+ else
+ {
+ if (!root->children)
+ {
+ int i;
+
+ root->children = xmalloc(sizeof(chr_t_entry*) * 256);
+ for (i = 0; i < 256; i++)
+ root->children[i] = 0;
+ }
+ root->children[(unsigned char) *from] =
+ set_map_string(root->children[(unsigned char) *from], from + 1,
+ len - 1, to);
+ }
+ return root;
+}
+
+int chr_map_chrs(chr_t_entry *t, char **from, int len, int *read, char **to,
+ int max)
+{
+ int i = 0;
+ unsigned char *s;
+
+ while (len && t->children && t->children[(unsigned char) **from])
+ {
+ t = t->children[(unsigned char) **from];
+ (*from)++;
+ len--;
+ }
+ /* if there were no matches, we are still at the root node,
+ which always has a null mapping */
+ for (s = t->target; *s && max; s++)
+ {
+ **to = *s;
+ s++;
+ (*to)++;
+ max--;
+ i++;
+ }
+ return i;
+}
+
+char **chr_map_input(chr_t_entry *t, char **from, int len)
+{
+ static char *buf[2] = {0, 0}, str[2] = {0, 0};
+ char *start = *from;
+
+ if (t)
+ {
+ while (len && t->children && t->children[(unsigned char) **from])
+ {
+ t = t->children[(unsigned char) **from];
+ (*from)++;
+ len--;
+ }
+ buf[0] = (char*) t->target;
+ }
+ else /* null mapping */
+ {
+ if (isalnum(**from))
+ {
+ str[0] = **from;
+ buf[0] = str;
+ }
+ else if (isspace(**from))
+ buf[0] = (char*) CHR_SPACE;
+ else
+ buf[0] = (char*) CHR_UNKNOWN;
+ }
+ if (start == *from)
+ (*from)++;
+ return buf;
+ /* return (char*) t->target; */
+}
+
+static unsigned char prim(char **s)
+{
+ unsigned char c;
+ unsigned int i;
+
+ if (**s == '\\')
+ {
+ (*s)++;
+ c = **s;
+ switch (c)
+ {
+ case '\\': c = '\\'; (*s)++; break;
+ case 'r': c = '\r'; (*s)++; break;
+ case 'n': c = '\n'; (*s)++; break;
+ case 't': c = '\t'; (*s)++; break;
+ case 's': c = ' '; (*s)++; break;
+ case 'x': sscanf(*s, "x%2x", &i); c = i; *s += 3; break;
+ case '{': case '[': case '(': case '}': case ']': case ')':
+ (*s)++;
+ break;
+ default: sscanf(*s, "%3o", &i); c = i; *s += 3; break;
+ }
+ return c;
+ }
+ c = **s;
+ ++(*s);
+ return c;
+}
+
+/*
+ * Callback function.
+ * Add an entry to the value space.
+ */
+static void fun_addentry(char *s, void *data, int num)
+{
+ chrmaptab *tab = data;
+ char tmp[2];
+
+ tmp[0] = num; tmp[1] = '\0';
+ tab->input = set_map_string(tab->input, s, strlen(s), tmp);
+ tab->output[num + tab->base_uppercase] = (unsigned char *) xstrdup(s);
+}
+
+/*
+ * Callback function.
+ * Add a space-entry to the value space.
+ */
+static void fun_addspace(char *s, void *data, int num)
+{
+ chrmaptab *tab = data;
+ tab->input = set_map_string(tab->input, s, strlen(s), (char*) CHR_SPACE);
+}
+
+static int scan_string(char *s, void (*fun)(char *c, void *data, int num),
+ void *data, int *num)
+{
+ unsigned char c, str[1024], begin, end;
+
+ while (*s)
+ {
+ switch (*s)
+ {
+ case '{':
+ s++;
+ begin = prim(&s);
+ if (*s != '-')
+ {
+ logf(LOG_FATAL, "Bad range in char-map");
+ return -1;
+ }
+ s++;
+ end = prim(&s);
+ if (end <= begin)
+ {
+ logf(LOG_FATAL, "Bad range in char-map");
+ return -1;
+ }
+ s++;
+ for (c = begin; c <= end; c++)
+ {
+ str[0] = c; str[1] = '\0';
+ (*fun)((char *) str, data, num ? (*num)++ : 0);
+ }
+ break;
+ case '[': s++; abort(); break;
+ case '(': s++; abort(); break;
+ default:
+ c = prim(&s);
+ str[0] = c; str[1] = '\0';
+ (*fun)((char *) str, data, num ? (*num)++ : 0);
+ }
+ }
+ return 0;
+}
+
+chrmaptab *chr_read_maptab(char *name)
+{
+ FILE *f;
+ char line[512], *argv[50];
+ chrmaptab *res = xmalloc(sizeof(*res));
+ int argc, num = (int) *CHR_BASE, i;
+
+ if (!(f = yaz_path_fopen(data1_tabpath, name, "r")))
+ {
+ logf(LOG_WARN|LOG_ERRNO, "%s", name);
+ return 0;
+ }
+ res = xmalloc(sizeof(*res));
+ res->input = xmalloc(sizeof(*res->input));
+ res->input->target = (unsigned char*) CHR_UNKNOWN;
+ res->input->equiv = 0;
+#if 0
+ res->input->children = xmalloc(sizeof(res->input) * 256);
+ for (i = 0; i < 256; i++)
+ {
+ res->input->children[i] = xmalloc(sizeof(*res->input));
+ res->input->children[i]->children = 0;
+ res->input->children[i]->target = CHR_UNKNOWN;
+ res->input->children[i]->equiv = 0;
+ }
+#else
+ res->input->children = 0;
+#endif
+ res->query_equiv = 0;
+ for (i = 0; i < 256; i++)
+ {
+ char *t = xmalloc(2);
+
+ t[0] = i;
+ t[1] = '\0';
+ res->output[i] = (unsigned char*)t;
+ }
+ res->output[(int) *CHR_SPACE] = (unsigned char *) " ";
+ res->output[(int) *CHR_UNKNOWN] = (unsigned char*) "@";
+ res->base_uppercase = 0;
+
+ while ((argc = readconf_line(f, line, 512, argv, 50)))
+ if (!yaz_matchstr(argv[0], "lowercase"))
+ {
+ if (argc != 2)
+ {
+ logf(LOG_FATAL, "Syntax error in charmap");
+ fclose(f);
+ return 0;
+ }
+ if (scan_string(argv[1], fun_addentry, res, &num) < 0)
+ {
+ logf(LOG_FATAL, "Bad value-set specification");
+ fclose(f);
+ return 0;
+ }
+ res->base_uppercase = num;
+ res->output[(int) *CHR_SPACE + num] = (unsigned char *) " ";
+ res->output[(int) *CHR_UNKNOWN + num] = (unsigned char*) "@";
+ num = (int) *CHR_BASE;
+ }
+ else if (!yaz_matchstr(argv[0], "uppercase"))
+ {
+ if (!res->base_uppercase)
+ {
+ logf(LOG_FATAL, "Uppercase directive with no lowercase set");
+ fclose(f);
+ return 0;
+ }
+ if (argc != 2)
+ {
+ logf(LOG_FATAL, "Syntax error in charmap");
+ fclose(f);
+ return 0;
+ }
+ if (scan_string(argv[1], fun_addentry, res, &num) < 0)
+ {
+ logf(LOG_FATAL, "Bad value-set specification");
+ fclose(f);
+ return 0;
+ }
+ }
+ else if (!yaz_matchstr(argv[0], "space"))
+ {
+ if (argc != 2)
+ {
+ logf(LOG_FATAL, "Syntax error in charmap");
+ fclose(f);
+ return 0;
+ }
+ if (scan_string(argv[1], fun_addspace, res, 0))
+ {
+ logf(LOG_FATAL, "Bad space specification");
+ fclose(f);
+ return 0;
+ }
+ }
+ else
+ {
+#if 0
+ logf(LOG_WARN, "Syntax error at '%s' in %s", line, file);
+ fclose(f);
+ return 0;
+#endif
+ }
+ fclose(f);
+ return res;
+}
projects / idzebra-moved-to-github.git / commitdiff