version 1.66, 2010/05/15 07:52:11 |
version 1.77, 2010/05/16 19:08:11 |
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/* $Id$ */ |
/* $Id$ */ |
/* |
/* |
* Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@bsd.lv> |
* Copyright (c) 2010 Kristaps Dzonsons <kristaps@bsd.lv> |
* |
* |
* Permission to use, copy, modify, and distribute this software for any |
* Permission to use, copy, modify, and distribute this software for any |
* purpose with or without fee is hereby granted, provided that the above |
* purpose with or without fee is hereby granted, provided that the above |
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#include "config.h" |
#include "config.h" |
#endif |
#endif |
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#include <assert.h> |
#include <stdlib.h> |
#include <stdlib.h> |
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#include <string.h> |
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#include <stdio.h> |
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#include "mandoc.h" |
#include "roff.h" |
#include "roff.h" |
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#define ROFF_CTL(c) \ |
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('.' == (c) || '\'' == (c)) |
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#if 0 |
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#define ROFF_MDEBUG(p, str) \ |
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fprintf(stderr, "%s: %s (%d:%d)\n", (str), \ |
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roffs[(p)->last->tok].name, \ |
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(p)->last->line, (p)->last->col) |
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#else |
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#define ROFF_MDEBUG(p, str) while (/* CONSTCOND */ 0) |
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#endif |
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enum rofft { |
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ROFF_if, |
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ROFF_ig, |
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ROFF_cblock, |
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ROFF_ccond, |
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#if 0 |
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ROFF_am, |
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ROFF_ami, |
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ROFF_de, |
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ROFF_dei, |
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ROFF_close, |
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#endif |
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ROFF_MAX |
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}; |
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struct roff { |
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struct roffnode *last; /* leaf of stack */ |
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mandocmsg msg; /* err/warn/fatal messages */ |
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void *data; /* privdata for messages */ |
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}; |
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struct roffnode { |
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enum rofft tok; /* type of node */ |
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struct roffnode *parent; /* up one in stack */ |
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char *end; /* end-token: custom */ |
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int line; /* parse line */ |
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int col; /* parse col */ |
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int endspan; |
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}; |
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#define ROFF_ARGS struct roff *r, /* parse ctx */ \ |
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enum rofft tok, /* tok of macro */ \ |
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char **bufp, /* input buffer */ \ |
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size_t *szp, /* size of input buffer */ \ |
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int ln, /* parse line */ \ |
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int ppos, /* original pos in buffer */ \ |
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int pos, /* current pos in buffer */ \ |
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int *offs /* reset offset of buffer data */ |
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typedef enum rofferr (*roffproc)(ROFF_ARGS); |
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struct roffmac { |
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const char *name; /* macro name */ |
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roffproc proc; |
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}; |
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static enum rofferr roff_if(ROFF_ARGS); |
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static enum rofferr roff_ig(ROFF_ARGS); |
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static enum rofferr roff_cblock(ROFF_ARGS); |
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static enum rofferr roff_ccond(ROFF_ARGS); |
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const struct roffmac roffs[ROFF_MAX] = { |
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{ "if", roff_if }, |
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{ "ig", roff_ig }, |
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{ ".", roff_cblock }, |
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{ "\\}", roff_ccond }, |
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#if 0 |
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{ "am", roff_sub_ig, roff_new_ig }, |
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{ "ami", roff_sub_ig, roff_new_ig }, |
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{ "de", roff_sub_ig, roff_new_ig }, |
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{ "dei", roff_sub_ig, roff_new_ig }, |
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#endif |
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}; |
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static void roff_free1(struct roff *); |
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static enum rofft roff_hash_find(const char *); |
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static void roffnode_cleanscope(struct roff *); |
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static int roffnode_push(struct roff *, |
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enum rofft, int, int); |
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static void roffnode_pop(struct roff *); |
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static enum rofft roff_parse(const char *, int *); |
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/* |
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* Look up a roff token by its name. Returns ROFF_MAX if no macro by |
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* the nil-terminated string name could be found. |
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*/ |
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static enum rofft |
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roff_hash_find(const char *p) |
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{ |
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int i; |
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/* FIXME: make this be fast and efficient. */ |
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for (i = 0; i < (int)ROFF_MAX; i++) |
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if (0 == strcmp(roffs[i].name, p)) |
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return((enum rofft)i); |
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return(ROFF_MAX); |
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} |
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/* |
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* Pop the current node off of the stack of roff instructions currently |
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* pending. |
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*/ |
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static void |
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roffnode_pop(struct roff *r) |
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{ |
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struct roffnode *p; |
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assert(r->last); |
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p = r->last; |
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r->last = r->last->parent; |
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if (p->end) |
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free(p->end); |
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free(p); |
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} |
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/* |
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* Push a roff node onto the instruction stack. This must later be |
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* removed with roffnode_pop(). |
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*/ |
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static int |
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roffnode_push(struct roff *r, enum rofft tok, int line, int col) |
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{ |
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struct roffnode *p; |
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if (NULL == (p = calloc(1, sizeof(struct roffnode)))) { |
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(*r->msg)(MANDOCERR_MEM, r->data, line, col, NULL); |
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return(0); |
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} |
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p->tok = tok; |
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p->parent = r->last; |
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p->line = line; |
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p->col = col; |
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r->last = p; |
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return(1); |
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} |
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static void |
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roff_free1(struct roff *r) |
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{ |
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while (r->last) |
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roffnode_pop(r); |
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} |
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void |
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roff_reset(struct roff *r) |
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{ |
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roff_free1(r); |
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} |
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void |
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roff_free(struct roff *r) |
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{ |
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roff_free1(r); |
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free(r); |
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} |
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struct roff * |
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roff_alloc(const mandocmsg msg, void *data) |
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{ |
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struct roff *r; |
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if (NULL == (r = calloc(1, sizeof(struct roff)))) { |
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(*msg)(MANDOCERR_MEM, data, 0, 0, NULL); |
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return(0); |
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} |
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r->msg = msg; |
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r->data = data; |
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return(r); |
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} |
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enum rofferr |
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roff_parseln(struct roff *r, int ln, |
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char **bufp, size_t *szp, int pos, int *offs) |
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{ |
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enum rofft t; |
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int ppos; |
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if (r->last && ! ROFF_CTL((*bufp)[pos])) { |
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if (ROFF_ig == r->last->tok) |
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return(ROFF_IGN); |
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roffnode_cleanscope(r); |
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/* FIXME: this assumes we're discarding! */ |
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return(ROFF_IGN); |
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} else if ( ! ROFF_CTL((*bufp)[pos])) |
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return(ROFF_CONT); |
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/* There's nothing on the stack: make us anew. */ |
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ppos = pos; |
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if (ROFF_MAX == (t = roff_parse(*bufp, &pos))) { |
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if (r->last && ROFF_ig == r->last->tok) |
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return(ROFF_IGN); |
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return(ROFF_CONT); |
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} |
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assert(roffs[t].proc); |
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return((*roffs[t].proc)(r, t, bufp, szp, ln, ppos, pos, offs)); |
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} |
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int |
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roff_endparse(struct roff *r) |
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{ |
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if (NULL == r->last) |
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return(1); |
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return((*r->msg)(MANDOCERR_SCOPEEXIT, r->data, r->last->line, |
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r->last->col, NULL)); |
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} |
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/* |
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* Parse a roff node's type from the input buffer. This must be in the |
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* form of ".foo xxx" in the usual way. |
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*/ |
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static enum rofft |
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roff_parse(const char *buf, int *pos) |
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{ |
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int j; |
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char mac[5]; |
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enum rofft t; |
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assert(ROFF_CTL(buf[*pos])); |
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(*pos)++; |
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while (buf[*pos] && (' ' == buf[*pos] || '\t' == buf[*pos])) |
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(*pos)++; |
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if ('\0' == buf[*pos]) |
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return(ROFF_MAX); |
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for (j = 0; j < 4; j++, (*pos)++) |
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if ('\0' == (mac[j] = buf[*pos])) |
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break; |
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else if (' ' == buf[*pos]) |
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break; |
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if (j == 4 || j < 1) |
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return(ROFF_MAX); |
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mac[j] = '\0'; |
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if (ROFF_MAX == (t = roff_hash_find(mac))) |
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return(t); |
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while (buf[*pos] && ' ' == buf[*pos]) |
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(*pos)++; |
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return(t); |
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} |
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/* ARGSUSED */ |
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static enum rofferr |
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roff_cblock(ROFF_ARGS) |
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{ |
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if (NULL == r->last) { |
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if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL)) |
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return(ROFF_ERR); |
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return(ROFF_IGN); |
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} |
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if (ROFF_ig != r->last->tok) { |
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if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL)) |
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return(ROFF_ERR); |
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return(ROFF_IGN); |
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} |
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if ((*bufp)[pos]) |
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if ( ! (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL)) |
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return(ROFF_ERR); |
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ROFF_MDEBUG(r, "closing ignore block"); |
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roffnode_pop(r); |
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roffnode_cleanscope(r); |
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return(ROFF_IGN); |
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} |
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static void |
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roffnode_cleanscope(struct roff *r) |
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{ |
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while (r->last) { |
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if (--r->last->endspan < 0) |
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break; |
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ROFF_MDEBUG(r, "closing implicit scope"); |
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roffnode_pop(r); |
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} |
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} |
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/* ARGSUSED */ |
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static enum rofferr |
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roff_ccond(ROFF_ARGS) |
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{ |
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if (NULL == r->last) { |
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if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL)) |
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return(ROFF_ERR); |
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return(ROFF_IGN); |
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} |
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if (ROFF_if != r->last->tok) { |
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if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL)) |
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return(ROFF_ERR); |
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return(ROFF_IGN); |
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} |
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if (r->last->endspan > -1) { |
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if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL)) |
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return(ROFF_ERR); |
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return(ROFF_IGN); |
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} |
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if ((*bufp)[pos]) |
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if ( ! (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL)) |
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return(ROFF_ERR); |
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ROFF_MDEBUG(r, "closing explicit scope"); |
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roffnode_pop(r); |
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roffnode_cleanscope(r); |
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return(ROFF_IGN); |
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} |
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/* ARGSUSED */ |
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static enum rofferr |
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roff_ig(ROFF_ARGS) |
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{ |
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if ( ! roffnode_push(r, tok, ln, ppos)) |
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return(ROFF_ERR); |
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ROFF_MDEBUG(r, "opening ignore block"); |
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if ((*bufp)[pos]) |
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if ( ! (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL)) |
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return(ROFF_ERR); |
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return(ROFF_IGN); |
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} |
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/* ARGSUSED */ |
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static enum rofferr |
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roff_if(ROFF_ARGS) |
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{ |
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int sv; |
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/* |
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* Read ahead past the conditional. |
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* FIXME: this does not work, as conditionals don't end on |
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* whitespace, but are parsed according to a formal grammar. |
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* It's good enough for now, however. |
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*/ |
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while ((*bufp)[pos] && ' ' != (*bufp)[pos]) |
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pos++; |
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sv = pos; |
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while (' ' == (*bufp)[pos]) |
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pos++; |
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/* |
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* Roff is weird. If we have just white-space after the |
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* conditional, it's considered the BODY and we exit without |
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* really doing anything. Warn about this. It's probably |
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* wrong. |
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*/ |
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if ('\0' == (*bufp)[pos] && sv != pos) { |
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if ( ! (*r->msg)(MANDOCERR_NOARGS, r->data, ln, ppos, NULL)) |
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return(ROFF_ERR); |
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return(ROFF_IGN); |
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} |
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if ( ! roffnode_push(r, tok, ln, ppos)) |
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return(ROFF_ERR); |
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/* Don't evaluate: just assume NO. */ |
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r->last->endspan = 1; |
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if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) { |
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ROFF_MDEBUG(r, "opening explicit scope"); |
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r->last->endspan = -1; |
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pos += 2; |
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} else |
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ROFF_MDEBUG(r, "opening implicit scope"); |
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/* |
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* If there are no arguments on the line, the next-line scope is |
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* assumed. |
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*/ |
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if ('\0' == (*bufp)[pos]) |
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return(ROFF_IGN); |
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/* Otherwise re-run the roff parser after recalculating. */ |
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*offs = pos; |
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return(ROFF_RERUN); |
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} |