Vystem 0.2

shelter/lib/src/std/string.c

@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: MPL-2.0
+#include "std/string.h"
+sh_uint64 sh_string_len(char *str) {
+  sh_uint64 i=0;
+  if (!str) return 0;
+  while (str[i]) i++;
+  return i;
+}
+sh_bool sh_string_compare(char *str1,char *str2,sh_uint64 length) {
+  sh_uint64 i=0;
+  if (!str1 || !str2) return SH_FALSE;
+  while (i<length) {
+    if (str1[i]!=str2[i]) return SH_FALSE;
+    if (str1[i]=='\0' && str2[i]=='\0') return SH_TRUE;
+    i++;
+  }
+  return 1;
+}
+sh_uint64 sh_string_find_char(char *str,char character) {
+  sh_uint64 i=0;
+  if (!str) return SH_UINT64_MAX;
+  while (str[i]) {
+    if (str[i]==character) return i;
+    i++;
+  }
+  return SH_UINT64_MAX;
+}
+sh_uint64 sh_string_find(char *str,char *substr) {
+  sh_uint64 i=0;
+  sh_uint64 j=0;
+  if (!str || !substr) return SH_UINT64_MAX;
+  if (!substr[0]) return 0;
+  while (str[i]) {
+    j=0;
+    while (str[i+j] && substr[j] && str[i+j]==substr[j]) j++;
+    if (!substr[j]) return i;
+    i++;
+  }
+  return SH_UINT64_MAX;
+}
+char *sh_string_substring(char *source_str,sh_uint64 start_index,sh_uint64 length,char *output) {
+  sh_uint64 i=0;
+  if (!source_str || !output) return SH_NULLPTR;
+  while (i<length && source_str[start_index+i]) {
+    output[i]=source_str[start_index+i];
+    i++;
+  }
+  output[i]='\0';
+  return output;
+}
+sh_uint64 sh_string_to_uint64(char *str) {
+  sh_uint64 result=0;
+  if (!str) return SH_UINT64_MAX;
+  while(*str) {
+    if (*str<'0' || *str>'9') break;
+    sh_uint64 digit=(sh_uint64)(*str-'0');
+    if (result>(SH_UINT64_MAX-digit)/10) return SH_UINT64_MAX;
+    result=result*10+digit;
+    str++;
+  }
+  return result;
+}