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- /* from Henry Spencer's stringlib */
- /* modified by ERS */
-
- #include <string.h>
-
- /*
- * strcmp - compare string s1 to s2
- */
-
- int /* <0 for <, 0 for ==, >0 for > */
- strcmp(scan1, scan2)
- register const char *scan1;
- register const char *scan2;
- {
- register char c1, c2;
-
- if (!scan1)
- return scan2 ? -1 : 0;
- if (!scan2) return 1;
-
- do {
- c1 = *scan1++; c2 = *scan2++;
- } while (c1 && c1 == c2);
-
- /*
- * The following case analysis is necessary so that characters
- * which look negative collate low against normal characters but
- * high against the end-of-string NUL.
- */
- if (c1 == c2)
- return(0);
- else if (c1 == '\0')
- return(-1);
- else if (c2 == '\0')
- return(1);
- else
- return(c1 - c2);
- }
-