src/xstring.c

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * By Daniel Borkmann <daniel@netsniff-ng.org>
   4  * Copyright 2009, 2010, 2011, 2012 Daniel Borkmann.
   5  * Copyright 2009, 2010, 2011, 2012 Emmanuel Roullit.
   6  * strlcpy, Copyright 1991, 1992  Linus Torvalds.
   7  * Subject to the GPL, version 2.
   8  */
   9
  10 #define _BSD_SOURCE
  11 #include <string.h>
  12 #include <stdio.h>
  13 #include <stdarg.h>
  14 #include <ctype.h>
  15 #include <stdint.h>
  16
  17 #include "xstring.h"
  18 #include "compiler.h"
  19
  20 size_t strlcpy(char *dest, const char *src, size_t size)
  21 {
  22         size_t ret = strlen(src);
  23         if (size) {
  24                 size_t len = (ret >= size) ? size - 1 : ret;
  25                 memcpy(dest, src, len);
  26                 dest[len] = '\0';
  27         }
  28         return ret;
  29 }
  30
  31 int slprintf(char *dst, size_t size, const char *fmt, ...)
  32 {
  33         int ret;
  34         va_list ap;
  35         va_start(ap, fmt);
  36         ret = vsnprintf(dst, size, fmt, ap);
  37         dst[size - 1] = '\0';
  38         va_end(ap);
  39         return ret;
  40 }
  41
  42 noinline void *xmemset(void *s, int c, size_t n)
  43 {
  44         size_t i;
  45         uint8_t *ptr = s;
  46         for (i = 0; i < n; ++i)
  47                 ptr[i] = (uint8_t) c;
  48         return ptr;
  49 }
  50
  51 char *getuint(char *in, uint32_t *out)
  52 {
  53         char *pt = in, tmp;
  54         char *endptr = NULL;
  55         while (*in && (isdigit(*in) || isxdigit(*in) || *in == 'x'))
  56                 in++;
  57         if (!*in)
  58                 panic("Syntax error!\n");
  59         errno = 0;
  60         tmp = *in;
  61         *in = 0;
  62         *out = strtoul(pt, &endptr, 0);
  63         if ((endptr != NULL && *endptr != '\0') || errno != 0) {
  64                 panic("Syntax error!\n");
  65         }
  66         *in = tmp;
  67         return in;
  68 }
  69
  70 char *strtrim_right(register char *p, register char c)
  71 {
  72         register char *end;
  73         register int len;
  74         len = strlen(p);
  75         while (*p && len) {
  76                 end = p + len - 1;
  77                 if (c == *end)
  78                         *end = 0;
  79                 else
  80                         break;
  81                 len = strlen(p);
  82         }
  83         return p;
  84 }
  85
  86 char *strtrim_left(register char *p, register char c)
  87 {
  88         register int len;
  89         len = strlen(p);
  90         while (*p && len--) {
  91                 if (c == *p)
  92                         p++;
  93                 else
  94                         break;
  95         }
  96         return p;
  97 }