common: cast arguments to character classification functions to unsigned char

[babeltrace.git] / src / plugins / ctf / common / metadata / lexer.l

diff --git a/src/plugins/ctf/common/metadata/lexer.l b/src/plugins/ctf/common/metadata/lexer.l
index 2dd456216a57044ad38f8bfeee0f3387519cddbb..d0695c6b12e6fafc85555fecbc5c2487f9199278 100644 (file)
--- a/src/plugins/ctf/common/metadata/lexer.l
+++ b/src/plugins/ctf/common/metadata/lexer.l
@@ -134,5 +134,5 @@ _Imaginary                  setstring(yyextra, yylval, yytext); return CTF_IMAGINARY;
 
 {IDENTIFIER}                   BT_LOGT("Got identifier: id=\"%s\"", yytext); setstring(yyextra, yylval, yytext); if (is_type(yyextra, yytext)) return ID_TYPE; else return IDENTIFIER;
 [ \t\r\n]                      ; /* ignore */
-.                              _BT_LOGE_LINENO(yylineno, "Invalid character: char=\"%c\", val=0x%02x", isprint(yytext[0]) ? yytext[0] : '\0', yytext[0]); return CTF_ERROR;
+.                              _BT_LOGE_LINENO(yylineno, "Invalid character: char=\"%c\", val=0x%02x", isprint((unsigned char) yytext[0]) ? yytext[0] : '\0', yytext[0]); return CTF_ERROR;
 %%