diff options
Diffstat (limited to 'buf.c')
| -rw-r--r-- | buf.c | 19 |
1 files changed, 13 insertions, 6 deletions
@@ -90,13 +90,20 @@ struct Buf *buf_prints (struct Buf *buf, const char *fmt, const char *s) */ struct Buf *buf_linedir (struct Buf *buf, const char* filename, int lineno) { - char *t, *fmt = "#line %d \"%s\"\n"; - size_t tsz; - - t = flex_alloc (tsz = strlen (fmt) + strlen (filename) + (int)(1 + log10(lineno>=0?lineno:-lineno)) + 1); + char *dst, *src, *t; + + t = flex_alloc (strlen ("#line \"\"\n") + /* constant parts */ + 2 * strlen (filename) + /* filename with possibly all backslashes escaped */ + (int) (1 + log10 (abs (lineno))) + /* line number */ + 1); /* NUL */ if (!t) - flexfatal (_("Allocation of buffer for line directive failed")); - snprintf (t, tsz, fmt, lineno, filename); + flexfatal (_("Allocation of buffer for line directive failed")); + for (dst = t + sprintf (t, "#line %d \"", lineno), src = filename; *src; *dst++ = *src++) + if (*src == '\\') /* escape backslashes */ + *dst++ = '\\'; + *dst++ = '"'; + *dst++ = '\n'; + *dst = '\0'; buf = buf_strappend (buf, t); flex_free (t); return buf; |