BSArch/01/prime.c

/* $Id: prime.c,v 1.13 2006/05/13 18:53:54 joko Exp $ */

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <limits.h>
#include <errno.h>

#ifdef _MSC_VER
#define snprintf _snprintf
#endif

#define BOOL int
#define TRUE 1
#define FALSE 0

#define PRINTPRIME(x) if (is_prime(x)) printf("%i\n", x)
#define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message)
#define PRINTWARNING(message) fprintf(stderr, "WARNING: %s\n", message)

#define MAX_LINE_LENGTH 80


/* check for prime number */
BOOL is_prime(long int number)
{
        int i,sq;
        /* negative values, 0 and 1 are never prime numbers */
        if (number < 2) return FALSE;
        sq=sqrt(number);
        
        /* check all numbers 2..sqrt(number) for being a prime number */
        for (i=2; i <= sq; i++) {
                if ((number % i) == 0)
                        return FALSE;
        }
        return TRUE;
}

/* convert from string to long int, with error checking */
long int convert_number(const char *nptr, BOOL warn) {
        
        char * endptr;
        errno = 0;
        long int number = strtol(nptr, &endptr, 10);
        
        /* invalid characters? */
        if (*endptr != '\0') {
                char message[256];
                snprintf(message, 255, "Could not convert '%s' to a valid (integer) number.", nptr);
                if(warn) 
                        PRINTWARNING(message);
                else{
                        PRINTERROR(message);
                        exit(EXIT_FAILURE);
                }
        }
        
        /* invalid range? */
        /* if (number == LONG_MAX || number == LONG_MIN) { */
        if (errno == ERANGE) {
                char message[256];
                snprintf(message, 255, "Number is not in range of 'long int': %s", nptr);
                if(warn)
                        PRINTWARNING(message);
                else{                   
                        PRINTERROR(message);
                        exit(EXIT_FAILURE);
                }
        }
        
        return number;
        
}

int main(int argc, char * argv[])
{
        
        if (argc == 1) {
                PRINTERROR("No arguments given.");
                exit(EXIT_FAILURE);
        }
        
        /* (3) range mode */
        if (argc > 2) {
                long int i, j;
                i = convert_number(argv[1],FALSE);
                j = convert_number(argv[2],FALSE);
                for (i; i< j; i++) {
                        PRINTPRIME(i);
                }
        
        /* other modes */
        } else {
                int err;
                /* try to open file for reading */
                FILE * fp = fopen(argv[1], "r");
                err=errno;
                /* (1) test-single-number mode: first argument is not a filename */
                if (fp == NULL) {
                        long int number = convert_number(argv[1],TRUE);
                        if(err){
                                fprintf(stderr, "%s: %s\n", argv[1], strerror(err));
                                return -1;
                        }
                        PRINTPRIME(number);
                
                /* (2) file mode: read numbers from file */
                } else {
                        char line[MAX_LINE_LENGTH + 1];
                        long int number;
                        int line_length;
                        long int line_no = 0;
                        while (fgets(line, MAX_LINE_LENGTH + 1, fp)) {
                                
                                /* count line number (for warnings) */
                                line_no++;

                                line_length = strlen(line);
                                
                                /* skip empty lines */
                                if (strlen(line) < 2) continue;

                                /* line handling: policy = skip exceeding lines */
                                
                                /* line exceeds max length */
                                if (line_length == MAX_LINE_LENGTH && line[line_length-1] != '\n') {
                                        char message[254];
                                        snprintf(message, 256, "Line too long (max %i chars) in line number: %i", MAX_LINE_LENGTH, line_no);
                                        PRINTWARNING(message);
                                        
                                        /* eat all characters until newline or EOF */
                                        while (1) {
                                                int charcode = fgetc(fp);
                                                if (charcode == 10 || charcode == EOF) break;
                                        }
                                        
                                        /* skip this line from prime calculation */
                                        continue;
                                }
                                
                                /* if last char is newline, strip it */
                                if (line[line_length-1] == '\n') {
                                        line[line_length-1] = '\0';
                                }
                                
                                /* finally: prime number calculation and output */
                                number = convert_number(line,FALSE);
                                PRINTPRIME(number);
                                
                        }
                        fclose(fp);
                }
        }
}
1	franky	1.14	/* $Id: prime.c,v 1.13 2006/05/13 18:53:54 joko Exp $ */
2	joko	1.5
3	joko	1.1	#include <stdio.h>
4	joko	1.6	#include <stdlib.h>
5	franky	1.14	#include <math.h>
6	joko	1.6	#include <limits.h>
7	joko	1.9	#include <errno.h>
8	joko	1.3
9	joko	1.13	#ifdef _MSC_VER
10			#define snprintf _snprintf
11			#endif
12
13	joko	1.6	#define BOOL int
14			#define TRUE 1
15			#define FALSE 0
16
17			#define PRINTPRIME(x) if (is_prime(x)) printf("%i\n", x)
18	joko	1.5	#define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message)
19	joko	1.10	#define PRINTWARNING(message) fprintf(stderr, "WARNING: %s\n", message)
20	joko	1.4
21	joko	1.11	#define MAX_LINE_LENGTH 80
22
23
24	joko	1.5	/* check for prime number */
25	joko	1.6	BOOL is_prime(long int number)
26	joko	1.1	{
27	franky	1.14	int i,sq;
28	joko	1.9	/* negative values, 0 and 1 are never prime numbers */
29	joko	1.7	if (number < 2) return FALSE;
30	franky	1.14	sq=sqrt(number);
31	joko	1.7
32			/* check all numbers 2..sqrt(number) for being a prime number */
33	franky	1.14	for (i=2; i <= sq; i++) {
34	joko	1.4	if ((number % i) == 0)
35	joko	1.6	return FALSE;
36			}
37			return TRUE;
38			}
39
40	joko	1.7	/* convert from string to long int, with error checking */
41	franky	1.14	long int convert_number(const char *nptr, BOOL warn) {
42	joko	1.9
43			char * endptr;
44	franky	1.14	errno = 0;
45	joko	1.9	long int number = strtol(nptr, &endptr, 10);
46
47			/* invalid characters? */
48			if (*endptr != '\0') {
49	franky	1.14	char message[256];
50			snprintf(message, 255, "Could not convert '%s' to a valid (integer) number.", nptr);
51			if(warn)
52			PRINTWARNING(message);
53			else{
54			PRINTERROR(message);
55			exit(EXIT_FAILURE);
56			}
57	joko	1.9	}
58
59			/* invalid range? */
60			/* if (number == LONG_MAX \|\| number == LONG_MIN) { */
61			if (errno == ERANGE) {
62	franky	1.14	char message[256];
63			snprintf(message, 255, "Number is not in range of 'long int': %s", nptr);
64			if(warn)
65			PRINTWARNING(message);
66			else{
67			PRINTERROR(message);
68			exit(EXIT_FAILURE);
69			}
70	joko	1.4	}
71	joko	1.9
72			return number;
73
74	joko	1.1	}
75	joko	1.3
76	joko	1.1	int main(int argc, char * argv[])
77			{
78	joko	1.4
79			if (argc == 1) {
80	joko	1.6	PRINTERROR("No arguments given.");
81	joko	1.9	exit(EXIT_FAILURE);
82	joko	1.4	}
83
84	joko	1.5	/* (3) range mode */
85	joko	1.4	if (argc > 2) {
86	joko	1.7	long int i, j;
87	franky	1.14	i = convert_number(argv[1],FALSE);
88			j = convert_number(argv[2],FALSE);
89	joko	1.9	for (i; i< j; i++) {
90	joko	1.1	PRINTPRIME(i);
91			}
92	joko	1.4
93	joko	1.5	/* other modes */
94	joko	1.4	} else {
95	franky	1.14	int err;
96	joko	1.5	/* try to open file for reading */
97	joko	1.4	FILE * fp = fopen(argv[1], "r");
98	franky	1.14	err=errno;
99	joko	1.5	/* (1) test-single-number mode: first argument is not a filename */
100	joko	1.4	if (fp == NULL) {
101	franky	1.14	long int number = convert_number(argv[1],TRUE);
102			if(err){
103			fprintf(stderr, "%s: %s\n", argv[1], strerror(err));
104			return -1;
105			}
106	joko	1.7	PRINTPRIME(number);
107	joko	1.4
108	joko	1.5	/* (2) file mode: read numbers from file */
109	joko	1.4	} else {
110	joko	1.11	char line[MAX_LINE_LENGTH + 1];
111	joko	1.10	long int number;
112	joko	1.11	int line_length;
113			long int line_no = 0;
114			while (fgets(line, MAX_LINE_LENGTH + 1, fp)) {
115	joko	1.10
116			/* count line number (for warnings) */
117	joko	1.11	line_no++;
118	joko	1.10
119	joko	1.11	line_length = strlen(line);
120
121	joko	1.10	/* skip empty lines */
122	joko	1.11	if (strlen(line) < 2) continue;
123	joko	1.10
124			/* line handling: policy = skip exceeding lines */
125
126			/* line exceeds max length */
127	joko	1.11	if (line_length == MAX_LINE_LENGTH && line[line_length-1] != '\n') {
128	joko	1.10	char message[254];
129	joko	1.11	snprintf(message, 256, "Line too long (max %i chars) in line number: %i", MAX_LINE_LENGTH, line_no);
130	joko	1.10	PRINTWARNING(message);
131
132	joko	1.11	/* eat all characters until newline or EOF */
133			while (1) {
134			int charcode = fgetc(fp);
135			if (charcode == 10 \|\| charcode == EOF) break;
136			}
137	joko	1.10
138			/* skip this line from prime calculation */
139			continue;
140			}
141
142	joko	1.11	/* if last char is newline, strip it */
143			if (line[line_length-1] == '\n') {
144			line[line_length-1] = '\0';
145			}
146
147			/* finally: prime number calculation and output */
148	franky	1.14	number = convert_number(line,FALSE);
149	joko	1.7	PRINTPRIME(number);
150	joko	1.11
151	joko	1.5	}
152	joko	1.1	fclose(fp);
153			}
154			}
155			}
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