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45 lines
1.2 KiB
45 lines
1.2 KiB
4 years ago
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/* strstr.c -- return the offset of one string within another
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Copyright (C) 1989, 1990 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Written by Mike Rendell <michael@cs.mun.ca>. */
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/* Return the starting address of string S2 in S1;
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return 0 if it is not found. */
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char *
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strstr (s1, s2)
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char *s1;
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char *s2;
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{
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int i;
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char *p1;
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char *p2;
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char *s = s1;
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for (p2 = s2, i = 0; *s; p2 = s2, i++, s++)
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{
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for (p1 = s; *p1 && *p2 && *p1 == *p2; p1++, p2++)
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;
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if (!*p2)
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break;
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}
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if (!*p2)
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return s1 + i;
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return 0;
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}
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