0.99.0

1 files changed, 183 insertions, 0 deletions

diff --git a/lib/str.h b/lib/str.h
new file mode 100644
index 0000000..6464dcf
--- /dev/null
+++ b/lib/str.h
@@ -0,0 +1,183 @@
+/*
+ * Copyright (c) 2026 Dylan Araps
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef DYLAN_STR_H
+#define DYLAN_STR_H
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "util.h"
+
+struct str;
+typedef usize (str_err)(struct str *, void *, usize l);
+
+typedef struct str {
+  char *m;
+  usize l;
+  usize c;
+
+  str_err *f;
+  void *ctx;
+} str;
+
+#define STR_ERR ((usize) -1)
+#define STR_PUSH(s, p)          str_push((s), (p), sizeof(p) - 1)
+#define STR_COPY(s, p)          str_copy((s), (p), sizeof(p) - 1)
+
+#define STR_INIT(s, m, f, ctx) do {                                            \
+  static char b[(m)];                                                          \
+  str_init((s), (b), sizeof(b), (f), (ctx));                                   \
+} while (0)
+
+static inline void
+str_init(str *s, char *b, usize c, str_err *f, void *ctx)
+{
+  s->m = b;
+  s->l = -(!b || !c);
+  s->c = c;
+  s->f = f;
+  s->ctx = ctx;
+}
+
+static inline usize
+str_cb(str *s, usize l)
+{
+  return s->f ? s->f(s, s->ctx, l) : STR_ERR;
+}
+
+static inline int
+str_fit(str *s, usize l)
+{
+  if (s->l + l < s->c) return 1;
+  return str_cb(s, l) != STR_ERR;
+}
+
+static inline void
+str_copy(str *s, const char *p, usize l)
+{
+  memcpy(&s->m[s->l], p, l);
+  s->l += l;
+}
+
+static inline void
+str_copy_c(str *s, char c)
+{
+  s->m[s->l++] = c;
+}
+
+static inline cut
+str_push(str *s, const char *p, usize l)
+{
+  if (!str_fit(s, l)) return (cut) { 0, 0 };
+  str_copy(s, p, l);
+  return (cut){ &s->m[s->l - l], l };
+}
+
+static inline void
+str_push_c(str *s, char c)
+{
+  if (!str_fit(s, 1)) return;
+  str_copy_c(s, c);
+}
+
+static inline void
+str_push_s(str *s, const char *p)
+{
+  str_push(s, p, strlen(p));
+}
+
+static inline void
+str_memset(str *s, int c, usize n)
+{
+  if (!str_fit(s, n)) return;
+  memset(&s->m[s->l], c, n);
+  s->l += n;
+}
+
+static inline void
+str_push_u32_b(str *s, u32 v, u32 b, int c, usize l)
+{
+  static const char d[] = "0123456789abcdef";
+  char o[33];
+  char *p = &o[sizeof(o)];
+  assert(b >= 2 && b <= 16);
+  do {
+    *--p = d[v % b];
+    v /= b;
+  } while (v);
+  usize n = (usize)(&o[sizeof(o)] - p);
+  if (n < l) str_memset(s, c, l - n);
+  str_push(s, p, n);
+}
+
+static inline void
+str_push_u32_p(str *s, u32 v, int c, usize l)
+{
+  str_push_u32_b(s, v, 10, c, l);
+}
+
+static inline void
+str_push_u32(str *s, u32 v)
+{
+  str_push_u32_p(s, v, 0, 0);
+}
+
+static inline void
+str_push_u64(str *s, u64 v)
+{
+  char b[21];
+  char *p = &b[sizeof(b)];
+  do {
+    *--p = (char)('0' + (v % 10));
+    v /= 10;
+  } while (v);
+  str_push(s, p, (usize)(&b[sizeof(b)] - p));
+}
+
+static inline void
+str_push_sanitize(str *s, const char *p, usize l)
+{
+  if (!str_fit(s, l)) return;
+  char *d = s->m + s->l;
+  const unsigned char *b = (const unsigned char *) p;
+  for (usize i = 0; i < l; i++) {
+    unsigned char c = b[i];
+    d[i] = (char)(c >= 0x20 && c != 0x7F ? c : '?');
+  }
+  s->l += l;
+}
+
+static inline int
+str_cmp(str *a, str *b)
+{
+  return a->l == b->l && *a->m == *b->m && !memcmp(a->m, b->m, b->l);
+}
+
+static inline void
+str_terminate(str *s)
+{
+  if (str_fit(s, 1)) s->m[s->l] = 0;
+}
+
+#endif // DYLAN_STR_H
+