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[/] [or1k/] [trunk/] [uclinux/] [uC-libc/] [misc/] [getopt.c] - Blame information for rev 1765

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/*
 * From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>) Newsgroups: net.sources
 * Subject: getopt library routine Date: 30 Mar 85 04:45:33 GMT
 */
/*
 * getopt -- public domain version of standard System V routine
 *
 * Strictly enforces the System V Command Syntax Standard; provided by D A
 * Gwyn of BRL for generic ANSI C implementations
 *
 * #define STRICT to prevent acceptance of clustered options with arguments
 * and ommision of whitespace between option and arg.
 */
 
#include <stdio.h>
#include <string.h>
 
int   opterr = 1;               /* error => print message */
int   optind = 1;               /* next argv[] index */
char *optarg = NULL;            /* option parameter if any */
 
static int
Err(name, mess, c)              /* returns '?' */
char *name;                     /* program name argv[0] */
char *mess;                     /* specific message */
int   c;                        /* defective option letter */
{
   if (opterr)
   {
      (void) fprintf(stderr,
                     "%s: %s -- %c\n",
                     name, mess, c
          );
   }
 
   return '?';                  /* erroneous-option marker */
}
 
int
getopt(argc, argv, optstring)   /* returns letter, '?', EOF */
int   argc;                     /* argument count from main */
char *argv[];                   /* argument vector from main */
char *optstring;                /* allowed args, e.g. "ab:c" */
{
   static int sp = 1;           /* position within argument */
   register int osp;            /* saved `sp' for param test */
#ifndef STRICT
   register int oind;           /* saved `optind' for param test */
#endif
   register int c;              /* option letter */
   register char *cp;           /* -> option in `optstring' */
 
   optarg = NULL;
 
   if (sp == 1)                 /* fresh argument */
      if (optind >= argc        /* no more arguments */
          || argv[optind][0] != '-'      /* no more options */
          || argv[optind][1] == '\0'    /* not option; stdin */
          )
         return EOF;
      else if (strcmp(argv[optind], "--") == 0)
      {
         ++optind;              /* skip over "--" */
         return EOF;            /* "--" marks end of options */
      }
 
   c = argv[optind][sp];        /* option letter */
   osp = sp++;                  /* get ready for next letter */
 
#ifndef STRICT
   oind = optind;               /* save optind for param test */
#endif
   if (argv[optind][sp] == '\0')/* end of argument */
   {
      ++optind;                 /* get ready for next try */
      sp = 1;                   /* beginning of next argument */
   }
 
   if (c == ':' || c == '?'     /* optstring syntax conflict */
       || (cp = strchr(optstring, c)) == NULL   /* not found */
       )
      return Err(argv[0], "illegal option", c);
 
   if (cp[1] == ':')            /* option takes parameter */
   {
#ifdef STRICT
      if (osp != 1)
         return Err(argv[0],
                    "option must not be clustered",
                    c
             );
 
      if (sp != 1)              /* reset by end of argument */
         return Err(argv[0],
                    "option must be followed by white space",
                    c
             );
 
#else
      if (oind == optind)       /* argument w/o whitespace */
      {
         optarg = &argv[optind][sp];
         sp = 1;                /* beginning of next argument */
      }
 
      else
#endif
      if (optind >= argc)
         return Err(argv[0],
                    "option requires an argument",
                    c
             );
 
      else                      /* argument w/ whitespace */
         optarg = argv[optind];
 
      ++optind;                 /* skip over parameter */
   }
 
   return c;
}

Line No.	Rev	Author	Line
1	199	simons
2			`/*`
3			`* From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>) Newsgroups: net.sources`
4			`* Subject: getopt library routine Date: 30 Mar 85 04:45:33 GMT`
5			`*/`
6			`/*`
7			`* getopt -- public domain version of standard System V routine`
8			`*`
9			`* Strictly enforces the System V Command Syntax Standard; provided by D A`
10			`* Gwyn of BRL for generic ANSI C implementations`
11			`*`
12			`* #define STRICT to prevent acceptance of clustered options with arguments`
13			`* and ommision of whitespace between option and arg.`
14			`*/`
15
16			`#include <stdio.h>`
17			`#include <string.h>`
18
19			`int opterr = 1; /* error => print message */`
20			`int optind = 1; /* next argv[] index */`
21			`char optarg = NULL; / option parameter if any */`
22
23			`static int`
24			`Err(name, mess, c) /* returns '?' */`
25			`char name; / program name argv[0] */`
26			`char mess; / specific message */`
27			`int c; /* defective option letter */`
28			`{`
29			`if (opterr)`
30			`{`
31			`(void) fprintf(stderr,`
32			`"%s: %s -- %c\n",`
33			`name, mess, c`
34			`);`
35			`}`
36
37			`return '?'; /* erroneous-option marker */`
38			`}`
39
40			`int`
41			`getopt(argc, argv, optstring) /* returns letter, '?', EOF */`
42			`int argc; /* argument count from main */`
43			`char argv[]; / argument vector from main */`
44			`char optstring; / allowed args, e.g. "ab:c" */`
45			`{`
46			`static int sp = 1; /* position within argument */`
47			register int osp; /* saved `sp' for param test */
48			`#ifndef STRICT`
49			register int oind; /* saved `optind' for param test */
50			`#endif`
51			`register int c; /* option letter */`
52			register char cp; / -> option in `optstring' */
53
54			`optarg = NULL;`
55
56			`if (sp == 1) /* fresh argument */`
57			`if (optind >= argc /* no more arguments */`
58			`\|\| argv[optind][0] != '-' /* no more options */`
59			`\|\| argv[optind][1] == '\0' /* not option; stdin */`
60			`)`
61			`return EOF;`
62			`else if (strcmp(argv[optind], "--") == 0)`
63			`{`
64			`++optind; /* skip over "--" */`
65			`return EOF; /* "--" marks end of options */`
66			`}`
67
68			`c = argv[optind][sp]; /* option letter */`
69			`osp = sp++; /* get ready for next letter */`
70
71			`#ifndef STRICT`
72			`oind = optind; /* save optind for param test */`
73			`#endif`
74			`if (argv[optind][sp] == '\0')/* end of argument */`
75			`{`
76			`++optind; /* get ready for next try */`
77			`sp = 1; /* beginning of next argument */`
78			`}`
79
80			`if (c == ':' \|\| c == '?' /* optstring syntax conflict */`
81			`\|\| (cp = strchr(optstring, c)) == NULL /* not found */`
82			`)`
83			`return Err(argv[0], "illegal option", c);`
84
85			`if (cp[1] == ':') /* option takes parameter */`
86			`{`
87			`#ifdef STRICT`
88			`if (osp != 1)`
89			`return Err(argv[0],`
90			`"option must not be clustered",`
91			`c`
92			`);`
93
94			`if (sp != 1) /* reset by end of argument */`
95			`return Err(argv[0],`
96			`"option must be followed by white space",`
97			`c`
98			`);`
99
100			`#else`
101			`if (oind == optind) /* argument w/o whitespace */`
102			`{`
103			`optarg = &argv[optind][sp];`
104			`sp = 1; /* beginning of next argument */`
105			`}`
106
107			`else`
108			`#endif`
109			`if (optind >= argc)`
110			`return Err(argv[0],`
111			`"option requires an argument",`
112			`c`
113			`);`
114
115			`else /* argument w/ whitespace */`
116			`optarg = argv[optind];`
117
118			`++optind; /* skip over parameter */`
119			`}`
120
121			`return c;`
122			`}`

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[/] [or1k/] [trunk/] [uclinux/] [uC-libc/] [misc/] [getopt.c] - Blame information for rev 1765