X-Git-Url: https://pd.if.org/git/?p=pdclib;a=blobdiff_plain;f=functions%2F_PDCLIB%2F_PDCLIB_ascii.c;fp=functions%2F_PDCLIB%2F_PDCLIB_ascii.c;h=ac5a593d963266367c61b18f814b834eda2fff08;hp=0000000000000000000000000000000000000000;hb=f60269dfbb4671b3bea11d1257de54bef0c9ffef;hpb=261086b873397b437ad024d44e9467f0fb2586ba

diff --git a/functions/_PDCLIB/_PDCLIB_ascii.c b/functions/_PDCLIB/_PDCLIB_ascii.c
new file mode 100644
index 0000000..ac5a593
--- /dev/null
+++ b/functions/_PDCLIB/_PDCLIB_ascii.c
@@ -0,0 +1,139 @@
+/* ASCII codec
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdbool.h>
+#ifndef REGTEST
+#include <uchar.h>
+#include "_PDCLIB_encoding.h"
+
+static bool ascii_mbsinit( const mbstate_t *ps )
+{ return 1; }
+
+static bool asciitoc32(
+    char32_t       *restrict *restrict   p_outbuf,
+    size_t                   *restrict   p_outsz,
+    const char     *restrict *restrict   p_inbuf,
+    size_t                   *restrict   p_insz,
+    mbstate_t                *restrict   p_ps
+)
+{
+    while(*p_outsz && *p_insz) {
+        unsigned char c = **p_inbuf;
+        if(c > 127)
+            return false;
+        
+        if(p_outbuf) {
+            **p_outbuf = c;
+            (*p_outbuf)++; 
+        }
+
+        (*p_inbuf)++;
+        (*p_insz)--; 
+        (*p_outsz)--;
+    }
+    return true;
+}
+
+static bool c32toascii(
+    char           *restrict *restrict  p_outbuf,
+    size_t                   *restrict  p_outsz,
+    const char32_t *restrict *restrict  p_inbuf,
+    size_t                   *restrict  p_insz,
+    mbstate_t                *restrict  p_ps
+)
+{
+    while(*p_outsz && *p_insz) {
+        char32_t c = **p_inbuf;
+        if(c > 127)
+            return false;
+
+        if(p_outbuf) {
+            **p_outbuf = c;
+            (*p_outbuf)++; 
+        }
+
+        (*p_inbuf)++;
+        (*p_insz)--; 
+        (*p_outsz)--;        
+    }
+    return true;
+}
+
+const struct _PDCLIB_charcodec_t _PDCLIB_ascii_codec = {
+    .__mbsinit   = ascii_mbsinit,
+    .__mbstoc32s = asciitoc32,
+    .__c32stombs = c32toascii,
+    .__mb_max    = 1,
+};
+
+#endif
+
+#ifdef TEST
+#include "_PDCLIB_test.h"
+
+int main( void )
+{
+#ifndef REGTEST
+    // Valid conversion & back
+
+    char32_t c32out[5];
+
+    char32_t *c32ptr = &c32out[0];
+    size_t    c32rem = 5;
+    char     *chrptr = (char*) &abcde[0];
+    size_t    chrrem = 5;
+    mbstate_t mbs = { 0 };
+
+    TESTCASE(asciitoc32(&c32ptr, &c32rem, &chrptr, &chrrem, &mbs) == true);
+    TESTCASE(c32rem == 0);
+    TESTCASE(chrrem == 0);
+    TESTCASE(c32ptr == &c32out[5]);
+    TESTCASE(chrptr == &abcde[5]);
+    TESTCASE(c32out[0] == 'a' && c32out[1] == 'b' && c32out[2] == 'c' && \
+             c32out[3] == 'd' && c32out[4] == 'e');
+
+    char chrout[5];
+    c32ptr = &c32out[0];
+    c32rem = 5;
+    chrptr = &chrout[0];
+    chrrem = 5;
+
+
+    TESTCASE(c32toascii(&chrptr, &chrrem, &c32ptr, &c32rem, &mbs) == true);
+    TESTCASE(c32rem == 0);
+    TESTCASE(chrrem == 0);
+    TESTCASE(c32ptr == &c32out[5]);
+    TESTCASE(chrptr == &chrout[5]);
+    TESTCASE(memcmp(chrout, abcde, 5) == 0);
+
+    // Invalid conversions
+    char badascii = '\xC0';
+    c32ptr = &c32out[0];
+    c32rem = 5;
+    chrptr = &badascii;
+    chrrem = 1;
+    TESTCASE(asciitoc32(&c32ptr, &c32rem, &chrptr, &chrrem, &mbs) == false);
+    TESTCASE(c32ptr == &c32out[0]);
+    TESTCASE(c32rem == 5);
+    TESTCASE(chrptr == &badascii);
+    TESTCASE(chrrem == 1);
+
+    char32_t baduni = 0xC0;
+    c32ptr = &baduni;
+    c32rem = 1;
+    chrptr = &chrout[0];
+    chrrem = 5;
+    TESTCASE(c32toascii(&chrptr, &chrrem, &c32ptr, &c32rem, &mbs) == false);
+    TESTCASE(c32ptr == &baduni);
+    TESTCASE(c32rem == 1);
+    TESTCASE(chrptr == &chrout[0]);
+    TESTCASE(chrrem == 5);
+#endif
+    return TEST_RESULTS;
+}
+
+#endif
+