1 files changed, 79 insertions, 0 deletions
diff --git a/stdio/getdelim.c b/stdio/getdelim.c
new file mode 100644
index 0000000..dfdadf2
--- /dev/null
+++ b/stdio/getdelim.c
@@ -0,0 +1,79 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/assert.h"
+#include "libc/calls/calls.h"
+#include "libc/errno.h"
+#include "libc/macros.internal.h"
+#include "libc/mem/mem.h"
+#include "libc/runtime/runtime.h"
+#include "libc/stdio/stdio.h"
+#include "libc/str/str.h"
+#include "libc/sysv/consts/o.h"
+
+/**
+ * Reads string from stream.
+ *
+ * @param s is the caller's buffer (in/out) which is extended or
+ *     allocated automatically, also NUL-terminated is guaranteed
+ * @param n is the capacity of s (in/out)
+ * @param delim is the stop char (and NUL is implicitly too)
+ * @return number of bytes read, including delim, excluding NUL, or -1
+ *     w/ errno on EOF or error; see ferror() and feof()
+ * @note this function can't punt EINTR to caller
+ * @see getline(), gettok_r()
+ */
+ssize_t getdelim(char **s, size_t *n, int delim, FILE *f) {
+  char *p;
+  ssize_t rc;
+  size_t i, m;
+  if ((f->iomode & O_ACCMODE) == O_WRONLY) {
+    f->state = errno = EBADF;
+    return -1;
+  }
+  if (f->beg > f->end || f->bufmode == _IONBF) {
+    f->state = errno = EINVAL;
+    return -1;
+  }
+  if (!*s) *n = 0;
+  for (i = 0;; i += m) {
+    m = f->end - f->beg;
+    if ((p = memchr(f->buf + f->beg, delim, m))) m = p + 1 - (f->buf + f->beg);
+    if (i + m + 1 > *n && !(*s = realloc(*s, (*n = i + m + 1)))) abort();
+    memcpy(*s + i, f->buf + f->beg, m);
+    (*s)[i + m] = '\0';
+    if ((f->beg += m) == f->end) f->beg = f->end = 0;
+    if (p) {
+      return i + m;
+    } else if (f->fd == -1) {
+      break;
+    } else if ((rc = read(f->fd, f->buf, f->size)) != -1) {
+      if (!rc) break;
+      f->end = rc;
+    } else if (errno != EINTR) {
+      f->state = errno;
+      return -1;
+    }
+  }
+  f->state = -1;
+  if (i + m) {
+    return i + m;
+  } else {
+    return -1;
+  }
+}