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/* SPDX-License-Identifier: BSD-2-Clause */
/* Copyright 1996-2016 The NASM Authors - All Rights Reserved */
/*
* nasmlib.c library routines for the Netwide Assembler
*/
#include "compiler.h"
#include "nasmlib.h"
#include "nctype.h"
#ifndef nasm_stricmp
int nasm_stricmp(const char *s1, const char *s2)
{
unsigned char c1, c2;
int d;
while (1) {
c1 = nasm_tolower(*s1++);
c2 = nasm_tolower(*s2++);
d = c1-c2;
if (d)
return d;
if (!c1)
break;
}
return 0;
}
#endif
#ifndef nasm_strnicmp
int nasm_strnicmp(const char *s1, const char *s2, size_t n)
{
unsigned char c1, c2;
int d;
while (n--) {
c1 = nasm_tolower(*s1++);
c2 = nasm_tolower(*s2++);
d = c1-c2;
if (d)
return d;
if (!c1)
break;
}
return 0;
}
#endif
int nasm_memicmp(const char *s1, const char *s2, size_t n)
{
unsigned char c1, c2;
int d;
while (n--) {
c1 = nasm_tolower(*s1++);
c2 = nasm_tolower(*s2++);
d = c1-c2;
if (d)
return d;
}
return 0;
}
#ifndef nasm_strsep
char *nasm_strsep(char **stringp, const char *delim)
{
char *s = *stringp;
char *e;
if (!s)
return NULL;
e = strpbrk(s, delim);
if (e)
*e++ = '\0';
*stringp = e;
return s;
}
#endif
/* skip leading spaces */
char *nasm_skip_spaces(const char *p)
{
if (p)
while (*p && nasm_isspace(*p))
p++;
return (char *)p;
}
/* skip leading non-spaces */
char *nasm_skip_word(const char *p)
{
if (p)
while (*p && !nasm_isspace(*p))
p++;
return (char *)p;
}
/* zap leading spaces with zero */
char *nasm_zap_spaces_fwd(char *p)
{
if (p)
while (*p && nasm_isspace(*p))
*p++ = 0x0;
return p;
}
/* zap spaces with zero in reverse order */
char *nasm_zap_spaces_rev(char *p)
{
if (p)
while (*p && nasm_isspace(*p))
*p-- = 0x0;
return p;
}
/* zap leading and trailing spaces */
char *nasm_trim_spaces(char *p)
{
p = nasm_zap_spaces_fwd(p);
nasm_zap_spaces_fwd(nasm_skip_word(p));
return p;
}
/*
* return the word extracted from a stream
* or NULL if nothing left
*/
char *nasm_get_word(char *p, char **tail)
{
char *word = nasm_skip_spaces(p);
char *next = nasm_skip_word(word);
if (word && *word) {
if (*next)
*next++ = '\0';
} else
word = next = NULL;
/* NOTE: the tail may start with spaces */
*tail = next;
return word;
}
/*
* Extract "opt=val" values from the stream and
* returns "opt"
*
* Exceptions:
* 1) If "=val" passed the NULL returned though
* you may continue handling the tail via "next"
* 2) If "=" passed the NULL is returned and "val"
* is set to NULL as well
*/
char *nasm_opt_val(char *p, char **val, char **next)
{
char *q, *nxt;
*val = *next = NULL;
p = nasm_get_word(p, &nxt);
if (!p)
return NULL;
q = strchr(p, '=');
if (q) {
if (q == p)
p = NULL;
*q++='\0';
if (*q) {
*val = q;
} else {
q = nasm_get_word(q + 1, &nxt);
if (q)
*val = q;
}
} else {
q = nasm_skip_spaces(nxt);
if (q && *q == '=') {
q = nasm_get_word(q + 1, &nxt);
if (q)
*val = q;
}
}
*next = nxt;
return p;
}
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