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don't call strncpy(str, NULL, 0)

This commit is contained in:
Guido van Rossum 1994-08-29 12:25:45 +00:00
parent 4ca6c9db81
commit bd0389d5fd
1 changed files with 79 additions and 81 deletions
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160
Parser/parsetok.c
View File

@ -1,5 +1,5 @@
/***********************************************************
Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
Copyright 1991, 1992, 1993, 1994 by Stichting Mathematisch Centrum,
Amsterdam, The Netherlands.
All Rights Reserved
@ -34,56 +34,59 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
/* Forward */
static int parsetok PROTO((struct tok_state *, grammar *, int, node **));
static node *parsetok PROTO((struct tok_state *, grammar *, int,
perrdetail *));
/* Parse input coming from a string. Return error code, print some errors. */
int
parsestring(s, g, start, n_ret)
node *
parsestring(s, g, start, err_ret)
char *s;
grammar *g;
int start;
node **n_ret;
perrdetail *err_ret;
{
struct tok_state *tok = tok_setups(s);
int ret;
if (tok == NULL) {
fprintf(stderr, "no mem for tok_setups\n");
return E_NOMEM;
struct tok_state *tok;
err_ret->error = E_OK;
err_ret->filename = NULL;
err_ret->lineno = 0;
err_ret->offset = 0;
err_ret->text = NULL;
if ((tok = tok_setups(s)) == NULL) {
err_ret->error = E_NOMEM;
return NULL;
}
ret = parsetok(tok, g, start, n_ret);
/*
XXX Need a more sophisticated way to report the line number.
if (ret == E_TOKEN || ret == E_SYNTAX) {
fprintf(stderr, "String parsing error at line %d\n",
tok->lineno);
}
*/
tok_free(tok);
return ret;
return parsetok(tok, g, start, err_ret);
}
/* Parse input coming from a file. Return error code, print some errors. */
int
parsefile(fp, filename, g, start, ps1, ps2, n_ret)
node *
parsefile(fp, filename, g, start, ps1, ps2, err_ret)
FILE *fp;
char *filename;
grammar *g;
int start;
char *ps1, *ps2;
node **n_ret;
perrdetail *err_ret;
{
struct tok_state *tok = tok_setupf(fp, ps1, ps2);
int ret;
if (tok == NULL) {
fprintf(stderr, "no mem for tok_setupf\n");
return E_NOMEM;
struct tok_state *tok;
err_ret->error = E_OK;
err_ret->filename = filename;
err_ret->lineno = 0;
err_ret->offset = 0;
err_ret->text = NULL;
if ((tok = tok_setupf(fp, ps1, ps2)) == NULL) {
err_ret->error = E_NOMEM;
return NULL;
}
#ifdef macintosh
{
int tabsize = guesstabsize(filename);
@ -91,60 +94,39 @@ parsefile(fp, filename, g, start, ps1, ps2, n_ret)
tok->tabsize = tabsize;
}
#endif
ret = parsetok(tok, g, start, n_ret);
if (ret == E_TOKEN || ret == E_SYNTAX) {
char *p;
fprintf(stderr, "Parsing error: file %s, line %d:\n",
filename, tok->lineno);
if (tok->buf == NULL)
fprintf(stderr, "(EOF)\n");
else {
*tok->inp = '\0';
if (tok->inp > tok->buf && tok->inp[-1] == '\n')
tok->inp[-1] = '\0';
fprintf(stderr, "%s\n", tok->buf);
for (p = tok->buf; p < tok->cur; p++) {
if (*p == '\t')
putc('\t', stderr);
else
putc(' ', stderr);
}
fprintf(stderr, "^\n");
}
}
tok_free(tok);
return ret;
}
return parsetok(tok, g, start, err_ret);
}
/* Parse input coming from the given tokenizer structure.
Return error code. */
static int
parsetok(tok, g, start, n_ret)
static node *
parsetok(tok, g, start, err_ret)
struct tok_state *tok;
grammar *g;
int start;
node **n_ret;
perrdetail *err_ret;
{
parser_state *ps;
int ret;
node *n;
int started = 0;
if ((ps = newparser(g, start)) == NULL) {
fprintf(stderr, "no mem for new parser\n");
return E_NOMEM;
err_ret->error = E_NOMEM;
return NULL;
}
for (;;) {
char *a, *b;
int type;
int len;
char *str;
type = tok_get(tok, &a, &b);
if (type == ERRORTOKEN) {
ret = tok->done;
err_ret->error = tok->done;
break;
}
if (type == ENDMARKER && started) {
@ -153,30 +135,46 @@ parsetok(tok, g, start, n_ret)
}
else
started = 1;
len = b - a;
len = b - a; /* XXX this may compute NULL - NULL */
str = NEW(char, len + 1);
if (str == NULL) {
fprintf(stderr, "no mem for next token\n");
ret = E_NOMEM;
err_ret->error = E_NOMEM;
break;
}
strncpy(str, a, len);
if (len > 0)
strncpy(str, a, len);
str[len] = '\0';
ret = addtoken(ps, (int)type, str, tok->lineno);
if (ret != E_OK) {
if (ret == E_DONE) {
*n_ret = ps->p_tree;
ps->p_tree = NULL;
}
else {
*n_ret = NULL;
if (tok->lineno <= 1 && tok->done == E_EOF)
ret = E_EOF;
}
if ((err_ret->error =
addtoken(ps, (int)type, str, tok->lineno)) != E_OK)
break;
}
if (err_ret->error == E_DONE) {
n = ps->p_tree;
ps->p_tree = NULL;
}
else
n = NULL;
delparser(ps);
if (n == NULL) {
if (tok->lineno <= 1 && tok->done == E_EOF)
err_ret->error = E_EOF;
err_ret->lineno = tok->lineno;
err_ret->offset = tok->cur - tok->buf;
if (tok->buf != NULL) {
int len = tok->inp - tok->buf;
err_ret->text = malloc(len + 1);
if (err_ret->text != NULL) {
strncpy(err_ret->text, tok->buf, len+1);
err_ret->text[len] = '\0';
}
}
}
delparser(ps);
return ret;
tok_free(tok);
return n;
}