src: Set errno = 0 before calling strtol

src/deflatehd.c

@@ -411,6 +411,7 @@ int main(int argc, char **argv)
       break;
     case 's':
       /* --table-size */
+      errno = 0;
       config.table_size = strtoul(optarg, &end, 10);
       if(errno == ERANGE || *end != '\0') {
         fprintf(stderr, "-s: Bad option value\n");
@@ -419,6 +420,7 @@ int main(int argc, char **argv)
       break;
     case 'S':
       /* --deflate-table-size */
+      errno = 0;
       config.deflate_table_size = strtoul(optarg, &end, 10);
       if(errno == ERANGE || *end != '\0') {
         fprintf(stderr, "-S: Bad option value\n");

src/inflatehd.c

@@ -269,6 +269,7 @@ int main(int argc, char **argv)
       exit(EXIT_SUCCESS);
     case 's':
       /* --table-size */
+      errno = 0;
       config.table_size = strtoul(optarg, &end, 10);
       if(errno == ERANGE || *end != '\0') {
         fprintf(stderr, "-s: Bad option value\n");

src/nghttp.cc

@@ -1837,6 +1837,7 @@ int main(int argc, char **argv)
       config.multiply = strtoul(optarg, nullptr, 10);
       break;
     case 'c':
+      errno = 0;
       config.header_table_size = strtol(optarg, &end, 10);
       if(errno == ERANGE || *end != '\0') {
         std::cerr << "-c: Bad option value: " << optarg << std::endl;

src/nghttpd.cc

@@ -167,6 +167,7 @@ int main(int argc, char **argv)
       config.verbose = true;
       break;
     case 'c':
+      errno = 0;
       config.header_table_size = strtol(optarg, &end, 10);
       if(errno == ERANGE || *end != '\0') {
         std::cerr << "-c: Bad option value: " << optarg << std::endl;