85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
#include <ctype.h>
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#include <gc.h>
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#include <gc/cord.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "util.h"
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public char *heap_strn(const char *str, size_t len)
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{
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if (!str) return NULL;
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if (len == 0) return "";
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char *heaped = GC_MALLOC_ATOMIC(len + 1);
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memcpy(heaped, str, len);
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heaped[len] = '\0';
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return heaped;
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}
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public char *heap_str(const char *str)
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{
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if (!str) return NULL;
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return heap_strn(str, strlen(str));
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}
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public char *heap_strf(const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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char *tmp = NULL;
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int len = vasprintf(&tmp, fmt, args);
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if (len < 0) return NULL;
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va_end(args);
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char *ret = heap_strn(tmp, (size_t)len);
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free(tmp);
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return ret;
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}
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// Name mangling algorithm to produce valid identifiers:
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// Escape individual chars as "_x%02X"
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// Things being escaped:
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// - Leading digit
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// - Non alphanumeric/non-underscore characters
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// - "_" when followed by "x" and two uppercase hex digits
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public char *mangle(const char *name)
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{
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size_t len = 0;
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for (const char *p = name; *p; p++) {
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if ((!isalnum(*p) && *p != '_') // Non-identifier character
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|| (p == name && isdigit(*p)) // Leading digit
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|| (p[0] == '_' && p[1] == 'x' && strspn(p+2, "ABCDEF0123456789") >= 2)) { // Looks like hex escape
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len += strlen("_x00"); // Hex escape
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} else {
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len += 1;
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}
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}
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char *mangled = GC_MALLOC_ATOMIC(len + 1);
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char *dest = mangled;
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for (const char *src = name; *src; src++) {
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if ((!isalnum(*src) && *src != '_') // Non-identifier character
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|| (src == name && isdigit(*src)) // Leading digit
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|| (src[0] == '_' && src[1] == 'x' && strspn(src+2, "ABCDEF0123456789") >= 2)) { // Looks like hex escape
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dest += sprintf(dest, "_x%02X", *src); // Hex escape
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} else {
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*(dest++) = *src;
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}
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}
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mangled[len] = '\0';
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return mangled;
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}
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CORD CORD_asprintf(const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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CORD c = NULL;
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CORD_vsprintf(&c, fmt, args);
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va_end(args);
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return c;
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}
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// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0
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