ext2 support, ext4 read only support

1 files changed, 106 insertions, 0 deletions

diff --git a/kernel/src/klibc/string.cpp b/kernel/src/klibc/string.cpp
index e4ead45..4663a1d 100644
--- a/kernel/src/klibc/string.cpp
+++ b/kernel/src/klibc/string.cpp
@@ -76,4 +76,110 @@ int klibc::strlen(const char *str) {
         len++;
     }
     return len;
+}
+
+char* klibc::strchr(const char *s, int c) {
+    while (*s) {
+        if (*s == (char)c) return (char *)s;
+        s++;
+    }
+    return nullptr;
+}
+
+char* klibc::strtok(char **next,char *str, const char *delim) {
+    if (str) *next = str;
+    if (!*next) return nullptr;
+
+    char *start = *next;
+    while (*start && strchr(delim, *start)) {
+        start++;
+    }
+    if (!*start) {
+        *next = nullptr;
+        return nullptr;
+    }
+
+    char *end = start;
+    while (*end && !strchr(delim, *end)) {
+        end++;
+    }
+
+    if (*end) {
+        *end = '\0';
+        *next = end + 1;
+    } else {
+        *next = nullptr;
+    }
+
+    return start;
+}
+
+char* klibc::strrchr(const char* str, int ch) {
+    char* last_occurrence = 0;
+
+    while (*str) {
+        if (*str == ch) {
+            last_occurrence = (char*)str; 
+        }
+        str++;
+    }
+
+    return last_occurrence;
+}
+
+char* klibc::strcat(char* dest, const char* src) {
+
+    char* ptr = dest;
+    while(*ptr != '\0') {
+        ptr++;
+    }
+    
+    while(*src != '\0') {
+        *ptr = *src;
+        ptr++;
+        src++;
+    }
+    
+    *ptr = '\0';
+    
+    return dest;
+}
+
+int klibc::strncmp(const char *s1, const char *s2, std::size_t n) {
+    std::size_t i = 0;
+    while (i < n && s1[i] && (s1[i] == s2[i])) {
+        i++;
+    }
+    if (i == n) return 0;
+    return (unsigned char)s1[i] - (unsigned char)s2[i];
+}
+
+// tbh i dont remember from what i took this
+int klibc::strcmp(const char *s1, const char *s2) {
+    const unsigned long *w1 = (const unsigned long *)s1;
+    const unsigned long *w2 = (const unsigned long *)s2;
+    const unsigned long himagic = 0x8080808080808080UL;
+    const unsigned long lomagic = 0x0101010101010101UL;
+    
+    while (1) {
+        unsigned long word1 = *w1++;
+        unsigned long word2 = *w2++;
+        
+        unsigned long diff = word1 ^ word2;
+        unsigned long zeros = (word1 - lomagic) & ~word1 & himagic;
+        
+        if (diff != 0 || zeros != 0) {
+            const char *c1 = (const char *)(w1 - 1);
+            const char *c2 = (const char *)(w2 - 1);
+            
+            do {
+                unsigned char ch1 = *c1++;
+                unsigned char ch2 = *c2++;
+                if (ch1 != ch2) return ch1 - ch2;
+                if (ch1 == 0) break;
+            } while (1);
+            
+            return 0;
+        }
+    }
 }
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