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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "buf.h"
typedef enum {
false,
true
} bool;
FILE* getfile(int argc, char** argv){
if (argc >= 2)
return fopen(argv[1], "r");
else
return stdin;
}
char* chrmult(char c, size_t ct){
char* str = malloc(sizeof(char)*(ct+1)); str[ct] = 0;
memset(str, c, ct);
return str;
}
// file read & buffer fill helpers
FILE* in;
buf* inbuf;
int addchr(void){
int c = fgetc(in);
if (c != EOF) inschrbuf(inbuf, c);
return c;
}
size_t fillbuf(size_t len){ // returns real len
int c;
size_t set;
for (set = buflen(inbuf); set < len && (c = addchr()) != EOF;set++);
return set;
}
size_t chrfill(char chr){
size_t len = buflen(inbuf);
char* str = peekstrbuf(inbuf, 0, len);
char* line = memchr(str,chr,len);
free(str);
if (line) return line-str+1;
for (int c = 0; c != chr && (c = addchr()) != EOF; len++);
return len;
}
#define min(a,b) a < b ? a : b
size_t chrnfill(char chr, size_t sz){//fills to first of chr or sz
size_t len = buflen(inbuf);
size_t lim = min(len,sz);
char* str = peekstrbuf(inbuf, 0, lim);
char* line = memchr(str, chr, lim);
free(str);
if (line) return line-str+1;
for (int c = 0; c != chr && (c = addchr()) != EOF&& len<sz; len++);
return len;
}
// typesetting config and commands to change.
int width = 80;
char* center(char* txt){
size_t len = strlen(txt);
int max = width/2 + len/2; // excluding terminator
int min = max-len+1; // first index of *txt
char* str = malloc(sizeof(char)*(max + 2));
memset(str, ' ', min);
memcpy(str+min, txt, len);
str[max] = '\n';
str[max+1] = 0;
return str;
}
char* setwidth(char* txt){
sscanf(txt, "%d", &width);
return NULL;
}
char* fillline(char* txt){
char* str = malloc(sizeof(char)*(width+2));
str[width] = '\n'; str[width+1] = 0;
memset(str, txt[0], width);
return str;
}
char* leader(char* txt){
char* cnxt;
char* start = strtok_r(txt, "|", &cnxt);
char* repeat = strtok_r(NULL, "|", &cnxt);
char* end = strtok_r(NULL, "|", &cnxt);
char* fin = malloc(sizeof(char)*(width+2));
fin[width] = '\n'; fin[width+1] = 0;
strcpy(fin, start);
size_t max = width-strlen(end); size_t rptln = strlen(repeat);
strcpy(fin+max, end);
for (int i=strlen(start); i<width-strlen(end); i++)
fin[i] = repeat[i % rptln];
return fin;
}
char* cmds[] =
{"CT ", "FIL ", "LD ", "W "}; // MUST be sorted alphabetically
char* (*call[])(char* txt) =
{center, fillline, leader, setwidth};
char* cmd(void){
char* dat = popstrbuf(inbuf, chrfill('\n'));
size_t low = 0; size_t high = sizeof(cmds)/sizeof(*cmds); //len
char* proc = NULL;
while (high >= low){
int mid = ((unsigned int)low + (unsigned int)high) >> 1;
char* mval = cmds[mid];
int cmp = strncmp(dat, mval, strlen(mval));
if (cmp < 0) // dat < mval
high = mid - 1;
else if (cmp > 0)
low = mid + 1;
else{
proc = call[mid](dat+strlen(mval));
break;
}
}
free(dat);
return proc;
}
// normal typesetting
char* wordset(char* txt){
char* orig = txt;
size_t len = strlen(txt);
size_t ws = width;
for (size_t i=0; i<len; i++){
if (txt[i] == ' ') ws = i;
if (i > width){
txt += ws;
txt[0] = '\n';
len -= ws;
ws = width;
i = 0;
}
}
return orig;
}
char* typeset(void){
size_t len = chrfill('\n');
return wordset(popstrbuf(inbuf, len));
}
// a parser to choose when to typeset and when to run a command
char* line(void){
size_t sz;
if ( (sz = fillbuf(2)) == 0)
return "";
char* twobytes = peekstrbuf(inbuf, 0, 2); // .., .\n, or ^.?
if (sz == 1 || twobytes[1] == '\n') return typeset();
if (twobytes[0] == '.') popchrbuf(inbuf);
if (twobytes[0] == '.' && twobytes[1] != '.'){
char* data = cmd();
if (data) return data;
return line();
} else {
return typeset();
}
}
// orchestration
int main(int argc, char** argv){
int c;
in = getfile(argc, argv);
inbuf = newbuf(256);
if (in == NULL){
perror(argv[1]);
return 1;
}
char* out;
while ( (out = line())[0] != '\0'){
printf("%s",out);
// free(out);
}
fclose(in);
return 0;
}
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