strstr.c File Reference

#include <sys/types.h>

Go to the source code of this file.

Typedefs
typedef unsigned	chartype

Functions
char *	strstr (const char *phaystack, const char *pneedle)

Typedef Documentation

chartype

typedef unsigned chartype

Definition at line 39 of file strstr.c.

Function Documentation

strstr()

char* strstr	(	const char *	phaystack,
		const char *	pneedle
	)

Definition at line 44 of file strstr.c.

References c.

Referenced by _nl_init_domain_conv(), add_links(), extract_plural_expression(), main(), rl_history_search_internal(), scan_request(), scan_table(), and yyparse().

{
  register const unsigned char *haystack, *needle;
  register chartype b, c;

  haystack = (const unsigned char *) phaystack;
  needle = (const unsigned char *) pneedle;

  b = *needle;
  if (b != '\0')
    {
      haystack--;               /* possible ANSI violation */
      do
    {
      c = *++haystack;
      if (c == '\0')
        goto ret0;
    }
      while (c != b);

      c = *++needle;
      if (c == '\0')
    goto foundneedle;
      ++needle;
      goto jin;

      for (;;)
        {
          register chartype a;
      register const unsigned char *rhaystack, *rneedle;

      do
        {
          a = *++haystack;
          if (a == '\0')
        goto ret0;
          if (a == b)
        break;
          a = *++haystack;
          if (a == '\0')
        goto ret0;
shloop:;    }
          while (a != b);

jin:      a = *++haystack;
      if (a == '\0')
        goto ret0;

      if (a != c)
        goto shloop;

      rhaystack = haystack-- + 1;
      rneedle = needle;
      a = *rneedle;

      if (*rhaystack == a)
        do
          {
        if (a == '\0')
          goto foundneedle;
        ++rhaystack;
        a = *++needle;
        if (*rhaystack != a)
          break;
        if (a == '\0')
          goto foundneedle;
        ++rhaystack;
        a = *++needle;
          }
        while (*rhaystack == a);

      needle = rneedle;        /* took the register-poor approach */

      if (a == '\0')
        break;
        }
    }
foundneedle:
  return (char*) haystack;
ret0:
  return 0;
}

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