Conversion functions

2026-09-12 10:08:59 -05:00
parent fd010ec112
commit 838861aeea
3 changed files with 377 additions and 2 deletions
@@ -1,6 +1,47 @@
+#include <errno.h>
+#include <stdlib.h>
 #include <string.h>
 #include "malunal/strview.h"

+#define STRVIEW_NUMBUF_SIZE 64
+
+static
+malunal_cstr_t
+describe(malunal_int32_t code) {
+  switch (code) {
+  case STRVIEW_ERROR_NULL_INPUT:
+    return "String view input was null.";
+  case STRVIEW_ERROR_OUT_OF_RANGE:
+    return "Conversion of string view to value was out of range.";
+  case STRVIEW_ERROR_UNCONSUMED:
+    return "String view was not consumed fully during conversion.";
+  }
+
+  return "Unknown strview error";
+}
+
+const error_domain_t ERROR_DOMAIN_STRVIEW_T = {
+  .describe = &describe,
+  .name     = "malunal.strview.error"
+};
+
+static malunal_size_t
+strview__copy_to_buffer(
+  strview_iptr_t self,
+  malunal_char_t buffer[STRVIEW_NUMBUF_SIZE]
+) {
+  malunal_size_t length = strview_length(self);
+  malunal_size_t copied =
+    length >= STRVIEW_NUMBUF_SIZE - 1
+      ? STRVIEW_NUMBUF_SIZE - 1
+      : length;
+
+  if (copied > 0)
+    memcpy(buffer, self->beg, copied);
+  buffer[copied] = '\0';
+  return copied;
+}
+

 strview_t
 strview(
@@ -178,3 +219,97 @@ strview_contains(

  return false;
 }
+
+error_t
+strview_to_int64(
+  strview_iptr_t   self,
+  malunal_int64_t* out
+) {
+  if (self == null) {
+    if (out != null)
+      *out = 0;
+    return (error_t) {
+      .domain = &ERROR_DOMAIN_STRVIEW_T,
+      .code   = STRVIEW_ERROR_NULL_INPUT
+    };
+  }
+
+  malunal_char_t buffer[STRVIEW_NUMBUF_SIZE];
+  malunal_size_t copied = strview__copy_to_buffer(self, buffer);
+  if (copied == 0) {
+    if (out != null)
+      *out = 0;
+    return (error_t) {
+      .domain = &ERROR_DOMAIN_STRVIEW_T,
+      .code   = STRVIEW_ERROR_UNCONSUMED
+    };
+  }
+
+  malunal_str_t   endptr;
+  malunal_int64_t value;
+
+  errno = 0;
+  value = strtoll(buffer, &endptr, 10);
+  if (out != null)
+    *out = value;
+
+  if (errno == ERANGE)
+    return (error_t) {
+      .domain = &ERROR_DOMAIN_STRVIEW_T,
+      .code   = STRVIEW_ERROR_OUT_OF_RANGE
+    };
+
+  return endptr != buffer + copied
+    ? (error_t) {
+        .domain = &ERROR_DOMAIN_STRVIEW_T,
+        .code   = STRVIEW_ERROR_UNCONSUMED
+      }
+    : NO_ERROR;
+}
+
+error_t
+strview_to_double(
+  strview_iptr_t    self,
+  malunal_double_t* out
+) {
+  if (self == null) {
+    if (out != null)
+      *out = 0.0;
+    return (error_t) {
+      .domain = &ERROR_DOMAIN_STRVIEW_T,
+      .code   = STRVIEW_ERROR_NULL_INPUT
+    };
+  }
+
+  malunal_char_t buffer[STRVIEW_NUMBUF_SIZE];
+  malunal_size_t copied = strview__copy_to_buffer(self, buffer);
+  if (copied == 0) {
+    if (out != null)
+      *out = 0.0;
+    return (error_t) {
+      .domain = &ERROR_DOMAIN_STRVIEW_T,
+      .code   = STRVIEW_ERROR_UNCONSUMED
+    };
+  }
+
+  malunal_str_t    endptr;
+  malunal_double_t value;
+
+  errno = 0;
+  value = strtod(buffer, &endptr);
+  if (out != null)
+    *out = value;
+
+  if (errno == ERANGE)
+    return (error_t) {
+      .domain = &ERROR_DOMAIN_STRVIEW_T,
+      .code   = STRVIEW_ERROR_OUT_OF_RANGE
+    };
+
+  return endptr != buffer + copied
+    ? (error_t) {
+        .domain = &ERROR_DOMAIN_STRVIEW_T,
+        .code   = STRVIEW_ERROR_UNCONSUMED
+      }
+    : NO_ERROR;
+}