Initial version.

src/nxt_file_name.c

@@ -0,0 +1,201 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) NGINX, Inc.
+ */
+
+#include <nxt_main.h>
+
+
+/*
+ * Supported formats:
+ *    %s     null-terminated string
+ *    %*s    length and string
+ *    %FN    nxt_file_name_t *
+ *    %V     nxt_str_t *
+ *    %Z     '\0', this null is not counted in file name lenght.
+ */
+
+nxt_int_t
+nxt_file_name_create(nxt_mem_pool_t *mp, nxt_file_name_str_t *file_name,
+    const char *format, ...)
+{
+    u_char           ch, *p;
+    size_t           len;
+    va_list          args;
+    nxt_str_t        *v;
+    nxt_bool_t       zero;
+    const char       *fmt;
+    nxt_file_name_t  *dst, *fn;
+
+    va_start(args, format);
+    fmt = format;
+    zero = 0;
+    len = 0;
+
+    for ( ;; ) {
+        ch = *fmt++;
+
+        if (ch != '%') {
+
+            if (ch != '\0') {
+                len++;
+                continue;
+            }
+
+            break;
+        }
+
+        ch = *fmt++;
+
+        switch (ch) {
+
+        case 'V':
+            v = va_arg(args, nxt_str_t *);
+
+            if (nxt_fast_path(v != NULL)) {
+                len += v->len;
+            }
+
+            continue;
+
+        case 's':
+            p = va_arg(args, u_char *);
+
+            if (nxt_fast_path(p != NULL)) {
+                while (*p != '\0') {
+                    p++;
+                    len++;
+                }
+            }
+
+            continue;
+
+        case '*':
+            len += va_arg(args, u_int);
+            fmt++;
+
+            continue;
+
+        case 'F':
+            ch = *fmt++;
+
+            if (nxt_fast_path(ch == 'N')) {
+                fn = va_arg(args, nxt_file_name_t *);
+
+                if (nxt_fast_path(fn != NULL)) {
+                    while (*fn != '\0') {
+                        fn++;
+                        len += sizeof(nxt_file_name_t);
+                    }
+                }
+            }
+
+            continue;
+
+        case 'Z':
+            zero = 1;
+            len++;
+            continue;
+
+        default:
+            continue;
+        }
+    }
+
+    va_end(args);
+
+    if (len == 0) {
+        return NXT_ERROR;
+    }
+
+    file_name->len = len - zero;
+
+    fn = nxt_file_name_alloc(mp, len);
+    if (nxt_slow_path(fn == NULL)) {
+        return NXT_ERROR;
+    }
+
+    file_name->start = fn;
+    dst = fn;
+
+    va_start(args, format);
+    fmt = format;
+
+    for ( ;; ) {
+        ch = *fmt++;
+
+        if (ch != '%') {
+
+            if (ch != '\0') {
+                *dst++ = (nxt_file_name_t) ch;
+                continue;
+            }
+
+            break;
+        }
+
+        ch = *fmt++;
+
+        switch (ch) {
+
+        case 'V':
+            v = va_arg(args, nxt_str_t *);
+
+            if (nxt_fast_path(v != NULL)) {
+                dst = nxt_file_name_add(dst, v->data, v->len);
+            }
+
+            continue;
+
+        case 's':
+            p = va_arg(args, u_char *);
+
+            if (nxt_fast_path(p != NULL)) {
+                while (*p != '\0') {
+                    *dst++ = (nxt_file_name_t) (*p++);
+                }
+            }
+
+            continue;
+
+        case '*':
+            len += va_arg(args, u_int);
+
+            ch = *fmt++;
+
+            if (nxt_fast_path(ch == 's')) {
+                p = va_arg(args, u_char *);
+                dst = nxt_file_name_add(dst, p, len);
+            }
+
+            continue;
+
+        case 'F':
+            ch = *fmt++;
+
+            if (nxt_fast_path(ch == 'N')) {
+                fn = va_arg(args, nxt_file_name_t *);
+
+                if (nxt_fast_path(fn != NULL)) {
+                    while (*fn != '\0') {
+                        *dst++ = *fn++;
+                    }
+                }
+            }
+
+            continue;
+
+        case 'Z':
+            *dst++ = '\0';
+            continue;
+
+        default:
+            continue;
+        }
+    }
+
+    va_end(args);
+
+    return NXT_OK;
+}