Fix up vmops generated code for c89 issues

src/libfsm/print/vmops.c

@@ -263,6 +263,7 @@ fsm_print_vmops(FILE *f, const struct fsm *fsm, enum vmops_dialect dialect)
 
 	case VMOPS_MAIN:
 		fprintf(f, "#include <stdio.h>\n");
+		fprintf(f, "#include <string.h>\n");
 		fprintf(f, "#include <stdlib.h>\n\n");
 		fprintf(f, "#ifndef %sLIBFSM_VMOPS_H\n", prefix);
 		fprintf(f, "#include \"%svmops.h\"\n", prefix);
@@ -353,9 +354,7 @@ fsm_print_vmops(FILE *f, const struct fsm *fsm, enum vmops_dialect dialect)
 		fprintf(f, "\n");
 		fprintf(f, "int main(void)\n");
 		fprintf(f, "{\n");
-		fprintf(f, "\tchar *buf;\n");
-		fprintf(f, "\tsize_t linecap = %sBUFFER_SIZE;\n", prefix);
-		fprintf(f, "\tssize_t linelen;\n");
+		fprintf(f, "\tchar *buf, *p;\n");
 		fprintf(f, "\tint r;\n");
 		fprintf(f, "\n");
 		fprintf(f, "\tbuf = malloc(%sBUFFER_SIZE);\n", prefix);
@@ -364,17 +363,17 @@ fsm_print_vmops(FILE *f, const struct fsm *fsm, enum vmops_dialect dialect)
 		fprintf(f, "\t\texit(1);\n");
 		fprintf(f, "\t}\n\n");
 		fprintf(f, "\tfor (;;) {\n");
-		fprintf(f, "\t\tlinelen = getline(&buf, &linecap, stdin);\n");
-		fprintf(f, "\t\tif (linelen <= 0) {\n");
+		fprintf(f, "\t\tp = fgets(buf, %sBUFFER_SIZE, stdin);\n", prefix);
+		fprintf(f, "\t\tif (!p) {\n");
 		fprintf(f, "\t\t\tbreak;\n");
 		fprintf(f, "\t\t}\n");
 
 		switch (fsm->opt->io) {
 		case FSM_IO_PAIR:
-			fprintf(f, "\t\tr = %smatch(buf, buf + linelen);\n", prefix);
+			fprintf(f, "\t\tr = %smatch(p, p + strlen(p));\n", prefix);
 			break;
 		case FSM_IO_STR:
-			fprintf(f, "\t\tr = %smatch(buf);\n", prefix);
+			fprintf(f, "\t\tr = %smatch(p);\n", prefix);
 			break;
 		case FSM_IO_GETC:
 			fprintf(stderr, "unsupported IO API\n");