mirror of
https://github.com/netwide-assembler/nasm.git
synced 2024-12-09 08:51:18 +08:00
439 lines
7.9 KiB
C
439 lines
7.9 KiB
C
/* quote.c library routines for the Netwide Assembler
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*
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* The Netwide Assembler is copyright (C) 1996 Simon Tatham and
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* Julian Hall. All rights reserved. The software is
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* redistributable under the license given in the file "LICENSE"
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* distributed in the NASM archive.
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*/
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#include "compiler.h"
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#include <assert.h>
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#include <stdlib.h>
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#include "nasmlib.h"
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#include "quote.h"
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#define numvalue(c) ((c)>='a' ? (c)-'a'+10 : (c)>='A' ? (c)-'A'+10 : (c)-'0')
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char *nasm_quote(char *str, size_t len)
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{
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char c, c1, *p, *q, *nstr, *ep;
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bool sq_ok, dq_ok;
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size_t qlen;
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sq_ok = dq_ok = true;
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ep = str+len;
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qlen = 0; /* Length if we need `...` quotes */
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for (p = str; p < ep; p++) {
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c = *p;
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switch (c) {
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case '\'':
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sq_ok = false;
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qlen++;
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break;
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case '\"':
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dq_ok = false;
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qlen++;
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break;
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case '`':
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case '\\':
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qlen += 2;
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break;
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default:
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if (c < ' ' || c > '~') {
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sq_ok = dq_ok = false;
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switch (c) {
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case '\a':
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case '\b':
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case '\t':
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case '\n':
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case '\v':
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case '\f':
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case '\r':
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case 27:
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qlen += 2;
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break;
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default:
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c1 = (p+1 < ep) ? p[1] : 0;
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if (c > 077 || (c1 >= '0' && c1 <= '7'))
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qlen += 4; /* Must use the full form */
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else if (c > 07)
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qlen += 3;
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else
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qlen += 2;
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break;
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}
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} else {
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qlen++;
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}
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break;
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}
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}
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if (sq_ok || dq_ok) {
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/* Use '...' or "..." */
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nstr = nasm_malloc(len+3);
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nstr[0] = nstr[len+1] = sq_ok ? '\'' : '\"';
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nstr[len+2] = '\0';
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memcpy(nstr+1, str, len);
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} else {
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/* Need to use `...` quoted syntax */
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nstr = nasm_malloc(qlen+3);
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q = nstr;
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*q++ = '`';
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for (p = str; p < ep; p++) {
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c = *p;
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switch (c) {
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case '`':
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case '\\':
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*q++ = '\\';
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*q++ = c;
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break;
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case 7:
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*q++ = '\\';
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*q++ = 'a';
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break;
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case 8:
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*q++ = '\\';
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*q++ = 'b';
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break;
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case 9:
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*q++ = '\\';
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*q++ = 't';
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break;
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case 10:
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*q++ = '\\';
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*q++ = 'n';
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break;
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case 11:
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*q++ = '\\';
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*q++ = 'v';
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break;
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case 12:
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*q++ = '\\';
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*q++ = 'f';
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break;
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case 13:
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*q++ = '\\';
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*q++ = 'r';
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break;
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case 27:
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*q++ = '\\';
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*q++ = 'e';
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break;
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default:
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if (c < ' ' || c > '~') {
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c1 = (p+1 < ep) ? p[1] : 0;
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if (c1 >= '0' && c1 <= '7')
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q += sprintf(q, "\\%03o", (unsigned char)c);
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else
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q += sprintf(q, "\\%o", (unsigned char)c);
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} else {
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*q++ = c;
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}
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break;
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}
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}
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*q++ = '`';
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*q++ = '\0';
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assert((size_t)(q-nstr) == qlen+3);
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}
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return nstr;
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}
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static char *emit_utf8(char *q, int32_t v)
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{
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if (v < 0) {
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/* Impossible - do nothing */
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} else if (v <= 0x7f) {
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*q++ = v;
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} else if (v <= 0x000007ff) {
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*q++ = 0xc0 | (v >> 6);
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*q++ = 0x80 | (v & 63);
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} else if (v <= 0x0000ffff) {
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*q++ = 0xe0 | (v >> 12);
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*q++ = 0x80 | ((v >> 6) & 63);
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*q++ = 0x80 | (v & 63);
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} else if (v <= 0x001fffff) {
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*q++ = 0xf0 | (v >> 18);
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*q++ = 0x80 | ((v >> 12) & 63);
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*q++ = 0x80 | ((v >> 6) & 63);
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*q++ = 0x80 | (v & 63);
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} else if (v <= 0x03ffffff) {
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*q++ = 0xf8 | (v >> 24);
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*q++ = 0x80 | ((v >> 18) & 63);
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*q++ = 0x80 | ((v >> 12) & 63);
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*q++ = 0x80 | ((v >> 6) & 63);
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*q++ = 0x80 | (v & 63);
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} else {
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*q++ = 0xfc | (v >> 30);
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*q++ = 0x80 | ((v >> 24) & 63);
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*q++ = 0x80 | ((v >> 18) & 63);
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*q++ = 0x80 | ((v >> 12) & 63);
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*q++ = 0x80 | ((v >> 6) & 63);
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*q++ = 0x80 | (v & 63);
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}
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return q;
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}
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/*
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* Do an *in-place* dequoting of the specified string, returning the
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* resulting length (which may be containing embedded nulls.)
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*
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* In-place replacement is possible since the unquoted length is always
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* shorter than or equal to the quoted length.
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*
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* *ep points to the final quote, or to the null if improperly quoted.
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*/
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size_t nasm_unquote(char *str, char **ep)
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{
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char bq;
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char *p, *q;
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char *escp = NULL;
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char c;
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enum unq_state {
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st_start,
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st_backslash,
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st_hex,
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st_oct,
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st_ucs,
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} state;
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int ndig = 0;
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int32_t nval = 0;
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p = q = str;
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bq = *p++;
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if (!bq)
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return 0;
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switch (bq) {
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case '\'':
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case '\"':
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/* '...' or "..." string */
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while ((c = *p) && c != bq) {
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p++;
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*q++ = c;
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}
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*q = '\0';
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break;
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case '`':
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/* `...` string */
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state = st_start;
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while ((c = *p)) {
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p++;
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switch (state) {
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case st_start:
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switch (c) {
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case '\\':
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state = st_backslash;
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break;
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case '`':
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p--;
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goto out;
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default:
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*q++ = c;
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break;
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}
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break;
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case st_backslash:
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state = st_start;
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escp = p; /* Beginning of argument sequence */
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nval = 0;
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switch (c) {
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case 'a':
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*q++ = 7;
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break;
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case 'b':
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*q++ = 8;
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break;
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case 'e':
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*q++ = 27;
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break;
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case 'f':
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*q++ = 12;
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break;
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case 'n':
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*q++ = 10;
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break;
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case 'r':
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*q++ = 13;
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break;
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case 't':
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*q++ = 9;
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break;
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case 'u':
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state = st_ucs;
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ndig = 4;
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break;
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case 'U':
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state = st_ucs;
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ndig = 8;
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break;
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case 'v':
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*q++ = 11;
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break;
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case 'x':
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case 'X':
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state = st_hex;
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ndig = 2;
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break;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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state = st_oct;
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ndig = 2; /* Up to two more digits */
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nval = c - '0';
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break;
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default:
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*q++ = c;
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break;
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}
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break;
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case st_oct:
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if (c >= '0' && c <= '7') {
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nval = (nval << 3) + (c - '0');
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if (!--ndig) {
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*q++ = nval;
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state = st_start;
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}
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} else {
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p--; /* Process this character again */
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*q++ = nval;
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state = st_start;
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}
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break;
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case st_hex:
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if ((c >= '0' && c <= '9') ||
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(c >= 'A' && c <= 'F') ||
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(c >= 'a' && c <= 'f')) {
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nval = (nval << 4) + numvalue(c);
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if (!--ndig) {
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*q++ = nval;
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state = st_start;
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}
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} else {
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p--; /* Process this character again */
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*q++ = (p > escp) ? nval : escp[-1];
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state = st_start;
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}
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break;
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case st_ucs:
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if ((c >= '0' && c <= '9') ||
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(c >= 'A' && c <= 'F') ||
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(c >= 'a' && c <= 'f')) {
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nval = (nval << 4) + numvalue(c);
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if (!--ndig) {
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q = emit_utf8(q, nval);
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state = st_start;
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}
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} else {
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p--; /* Process this character again */
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if (p > escp)
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q = emit_utf8(q, nval);
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else
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*q++ = escp[-1];
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state = st_start;
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}
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break;
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}
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}
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switch (state) {
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case st_start:
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case st_backslash:
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break;
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case st_oct:
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*q++ = nval;
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break;
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case st_hex:
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*q++ = (p > escp) ? nval : escp[-1];
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break;
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case st_ucs:
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if (p > escp)
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q = emit_utf8(q, nval);
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else
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*q++ = escp[-1];
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break;
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}
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out:
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break;
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default:
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/* Not a quoted string, just return the input... */
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p = q = strchr(str, '\0');
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break;
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}
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if (ep)
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*ep = p;
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return q-str;
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}
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/*
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* Find the end of a quoted string; returns the pointer to the terminating
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* character (either the ending quote or the null character, if unterminated.)
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*/
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char *nasm_skip_string(char *str)
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{
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char bq;
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char *p;
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char c;
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enum unq_state {
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st_start,
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st_backslash,
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} state;
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bq = str[0];
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if (bq == '\'' || bq == '\"') {
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/* '...' or "..." string */
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for (p = str+1; *p && *p != bq; p++)
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;
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return p;
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} else if (bq == '`') {
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/* `...` string */
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p = str+1;
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state = st_start;
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while ((c = *p++)) {
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switch (state) {
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case st_start:
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switch (c) {
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case '\\':
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state = st_backslash;
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break;
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case '`':
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return p-1; /* Found the end */
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default:
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break;
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}
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break;
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case st_backslash:
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/*
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* Note: for the purpose of finding the end of the string,
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* all successor states to st_backslash are functionally
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* equivalent to st_start, since either a backslash or
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* a backquote will force a return to the st_start state.
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*/
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state = st_start;
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break;
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}
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}
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return p; /* Unterminated string... */
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} else {
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return str; /* Not a string... */
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}
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}
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