Add string extra methods

include/extra/string.h

@@ -17,6 +17,12 @@ extern size_t string_to_lower  (vtype_string* x) LIBCDSB_nt__ LIBCDSB_nn1__;
 extern size_t string_to_upper  (vtype_string* x) LIBCDSB_nt__ LIBCDSB_nn1__;
 extern size_t string_capitalize(vtype_string* x) LIBCDSB_nt__ LIBCDSB_nn1__;
 
+extern size_t string_reverse   (vtype_string* x) LIBCDSB_nt__ LIBCDSB_nn1__;
+
+extern size_t string_align_center(vtype_string* x, size_t padsize, int padchr) LIBCDSB_nt__ LIBCDSB_nn1__;
+extern size_t string_align_right (vtype_string* x, size_t padsize, int padchr) LIBCDSB_nt__ LIBCDSB_nn1__;
+extern size_t string_align_left  (vtype_string* x, size_t padsize, int padchr) LIBCDSB_nt__ LIBCDSB_nn1__;
+
 
 extern int string_compare_case_insensitive(const vtype_string* s0, const vtype_string* s1) LIBCDSB_cmpattr__;
 

src/string/extra-align.c

@@ -0,0 +1,142 @@
+/* This software is licensed by the MIT License, see LICENSE file */
+/*                                Copyright © 2022 Gregory Lirent */
+
+#include "include.h"
+
+
+/*#####################################################################################################################*/
+
+
+static char* string_info(const vtype_string* s, size_t* size, size_t* nmemb) {
+
+    char* p;
+    char* v;
+
+    if (is_null(s->buffer) || !*s->buffer) {
+        *size = *nmemb = 0;
+        return s->buffer;
+    }
+
+    *size = *nmemb = strasciilen(s->buffer);
+    p = s->buffer + *nmemb;
+
+    if (!*p) return p;
+
+    while (*(v = next_char(p))) {
+        ++*size;
+        *nmemb += v - p;
+        p = v;
+    }
+    ++*size;
+    *nmemb += v - p;
+
+    return p;
+}
+
+
+static int fetch_pad(char buffer[4], int chr) {
+
+    char* p;
+
+    if (chr) {
+        p = tochar_unicode(buffer, chr);
+        chr = !is_null(p) ? p - buffer : 0;
+    }
+
+    if (!chr) {
+       *buffer = ' ';
+        chr    = 1;
+    }
+
+    return chr;
+}
+
+
+/*#####################################################################################################################*/
+
+
+size_t string_align_center(vtype_string* x, size_t n, int pc) {
+
+    char s[4];
+    size_t l;
+    size_t ls;
+    size_t rs;
+    char*  p;
+
+    string_info(x, &ls, &l);
+
+    if (ls < n) {
+        pc = fetch_pad(s, pc);
+        ls = n - ls;
+        rs = ls / 2;
+    } else return ls;
+
+    x->buffer = p = realloc(x->buffer, l + ls*pc + 1);
+    memmove(x->buffer + (ls -= rs)*pc, x->buffer, l);
+
+    for (size_t i = 0; i < ls; ++i) {
+        p = memcpy(p, s, pc) + pc;
+    }
+
+    p += l;
+
+    for (size_t i = 0; i < rs; ++i) {
+        p = memcpy(p, s, pc) + pc;
+    }
+
+    *p = 0;
+
+    return n;
+}
+
+
+size_t string_align_right(vtype_string* x, size_t n, int pc) {
+
+    char s[4];
+    size_t l;
+    size_t ls;
+    char*  p;
+
+    string_info(x, &ls, &l);
+
+    if (ls < n) {
+        pc = fetch_pad(s, pc);
+        ls = n - ls;
+    } else return ls;
+
+    x->buffer = p = realloc(x->buffer, ++l + ls*pc);
+    memmove(x->buffer + ls*pc, x->buffer, l);
+
+    for (size_t i = 0; i < ls; ++i) {
+        p = memcpy(p, s, pc) + pc;
+    }
+
+    return n;
+}
+
+
+size_t string_align_left(vtype_string* x, size_t n, int pc) {
+
+    char s[4];
+    size_t l;
+    size_t rs;
+    char*  p;
+
+    string_info(x, &rs, &l);
+
+    if (rs < n) {
+        pc = fetch_pad(s, pc);
+        rs = n - rs;
+    } else return rs;
+
+    x->buffer = realloc(x->buffer, l + rs*pc + 1);
+    p = x->buffer + l;
+
+    for (size_t i = 0; i < rs; ++i) {
+        p = memcpy(p, s, pc) + pc;
+    }
+
+    *p = 0;
+
+    return n;
+}

src/string/extra.c

@@ -175,3 +175,35 @@ size_t string_capitalize(str_t* x) {
 
     return n;
 }
+
+
+/*#####################################################################################################################*/
+
+
+size_t string_reverse(str_t* x) {
+    char *t, *p, *v;
+    size_t n;
+
+    if (is_null(x->buffer) || !*x->buffer)
+        return 0;
+
+    n = strlen(x->buffer);
+    t = malloc(n + 1);
+    p = t + n;
+    v = x->buffer;
+    n = 0;
+
+    while (p > t) {
+        int cs = charsize(v);
+
+        if (cs > 1) {
+            p  = memcpy(p - cs, v, cs);
+            v += cs;
+        } else *(--p) = *(v++);
+    }
+
+    free(x->buffer);
+    x->buffer = t;
+
+    return n;
+}