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103 lines
3.7 KiB
C
103 lines
3.7 KiB
C
#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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typedef unsigned char uchar;
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typedef struct{char * nm; int v;} vp;
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vp vpl[] = {
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{"nbsp", 160}, {"lt",0x3c}, {"amp", 38},
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{"eacute", 233}, {"egrave", 232}, {"ouml", 246},
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{"alpha", 0x3b1}, {"beta", 0x3b2}, {"gamma", 0x3b3},
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{"delta", 0x3b4}, {"Delta", 0x394},
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{"sigma", 0x3c3}, {"Sigma", 0x3a3},
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{"epsilon", 0x3b5}, {"zeta", 0x3b6},
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{"theta", 0x3b8}, {"mu", 0x3bc},
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{"phi", 0x3c6},
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{"omega", 0x3c9},
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{"lambda", 0x3bb}, {"rho", 0x3c1},
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{"pi", 0x3c0}, {"Pi", 0x3a0},
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{"ndash", 0x2013}, {"mdash", 0x2014},
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{"and", 8743}, {"rarr", 8594}, {"forall", 0x2200},
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{"sum", 8721}};
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int cc = 0; // count of conversions.
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static void Utf(int m, uint a){
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if (a & m) {Utf(m>>1, a>>6); putchar(128 | a & 63);}
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else putchar((m<<1)&255 | a);}
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static void utf8(uint a){
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if(a == '<') printf("%s", "<");
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else if(a == '&') printf("%s", "&");
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else if(a & -128) {++cc;
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Utf(-32, a>>6); putchar(128 | a & 63);} else putchar(a);}
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char * em[] = {"", "tag", "quoted string", "utf", "character ref"};
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int lc = 1, cil = 0, tcc=0;
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char gc(int x){char c = getchar();
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if(c == EOF && feof(stdin)) {
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if(x) fprintf(stderr, "file ended in %s\n", em[x]);
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fprintf(stderr, "Converted %d characters\n", cc);
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exit(0);}
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if(c == 10 || c == 13) {tcc += cil; cil = 0; ++lc;}
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++cil; return c;}
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void loc(){fprintf(stderr, "Ending at byte %d of line %d,"
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"(or 0x%x in file):\n", cil, lc, tcc+cil);}
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char gx(){char c = gc(3); if ((c&0xc0) != 0x80)
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{loc(); fprintf(stderr, "Bad utf8 extension byte: %02X\n", c);}
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return c;}
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int main(int argc, char * * args){
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int bk = argc == 2;
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while(1){
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int vx(int x){if((x & 0xffffffe0) == 0x80){
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if(x == 150) return 8211;
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if(x == 151) return 8212;
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loc(); fprintf(stderr, "Invalid character: 0x%x=%d\n", x, x);}
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return x;}
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uchar c = gc(0);
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if(c == '<'){putchar(c); while(1){char c = gc(1);
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if(c == '"'){putchar(c); while(1){char c = gc(2);
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if(c == '"'){putchar(c); break;}
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else putchar(c);}}
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else if(c == '>'){putchar(c); break;}
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else putchar(c);}}
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else if(bk && c > 127){int v=0, sc=0, C=c;
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while(C&0x40){C <<=1; v = (v<<6) | gx() & 0x3f; ++sc;}
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{int uc = vx(v | (0x3f>>sc & (int)c) << 6*sc);
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{int k = sizeof(vpl)/sizeof(vp);
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while(k--) if(uc == vpl[k].v)
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{printf("&%s;", vpl[k].nm); goto end;}}
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printf("&#x%x;", uc);}
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end: ++cc;}
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else if(!bk && c == '&') {char c = gc(4);
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int gs(char c, int r){
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int vd(char c){if('0' <= c && c <= '9') return c - '0';
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{char lc = tolower(c);
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if(r == 16 && 'a' <= lc && lc <= 'f') return lc - 'a' + 10;
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loc();
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fprintf(stderr, "Invalid digit folowing \"&#\" construct.");
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exit(0);
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return 0;}}
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int k = vd(c);
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while(1){char c = gc(4); if(c == ';') return k;
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k = r*k + vd(c);}}
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if(c == '#') {char c = gc(4);
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utf8(vx(c == 'x' || c == 'X' ? gs('0', 16) : gs(c, 10)));}
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else {int k = sizeof(vpl)/sizeof(vp);
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char st[10]; st[0] = c;
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{int n; for(n=1; n<10; ++n) {char c = gc(4);
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if(c == ';') goto e1;
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if(!isalpha(c)) break;
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st[n] = c;}
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loc(); fprintf(stderr, "%s reference\n",
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n>10?"Verbose":"Invalid");
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continue;
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e1: st[n] = 0;
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// loc(); fprintf(stderr, "string is <%s>.\n", st);
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while(k--) if(!strcmp(st, vpl[k].nm)) {
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utf8(vpl[k].v); break;}
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if(k<0) {loc();
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fprintf(stderr, "Unrecognized reference: &%s;\n", st);}}}}
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else if(c > 127) {loc(); fprintf(stderr, "Non ASCII char.\n");}
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else putchar(c);
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}
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return 0;
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}
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