BSArch/01/prime.c

/* $Id: prime.c,v 1.16 2006/05/15 11:27:10 franky 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;
        long int number;

        errno = 0;
        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);
                errno=EINVAL;
                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);
                errno=EINVAL;
                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;
                errno=0;
                /* (1) test-single-number mode: first argument is not a filename */
                if (fp == NULL) {
                        long int number = convert_number(argv[1],TRUE);
                        if(errno){
                                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	/* $Id: prime.c,v 1.16 2006/05/15 11:27:10 franky Exp $ */
2
3	#include <stdio.h>
4	#include <stdlib.h>
5	#include <math.h>
6	#include <limits.h>
7	#include <errno.h>
8
9	#ifdef _MSC_VER
10	#define snprintf _snprintf
11	#endif
12
13	#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	#define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message)
19	#define PRINTWARNING(message) fprintf(stderr, "WARNING: %s\n", message)
20
21	#define MAX_LINE_LENGTH 80
22
23
24	/* check for prime number */
25	BOOL is_prime(long int number)
26	{
27	int i,sq;
28	/* negative values, 0 and 1 are never prime numbers */
29	if (number < 2) return FALSE;
30	sq=sqrt(number);
31
32	/* check all numbers 2..sqrt(number) for being a prime number */
33	for (i=2; i <= sq; i++) {
34	if ((number % i) == 0)
35	return FALSE;
36	}
37	return TRUE;
38	}
39
40	/* convert from string to long int, with error checking */
41	long int convert_number(const char *nptr, BOOL warn) {
42
43	char * endptr;
44	long int number;
45
46	errno = 0;
47	number = strtol(nptr, &endptr, 10);
48
49	/* invalid characters? */
50	if (*endptr != '\0') {
51	char message[256];
52	snprintf(message, 255, "Could not convert '%s' to a valid (integer) number.", nptr);
53	errno=EINVAL;
54	if(warn)
55	PRINTWARNING(message);
56	else{
57	PRINTERROR(message);
58	exit(EXIT_FAILURE);
59	}
60	}
61
62	/* invalid range? */
63	/* if (number == LONG_MAX \|\| number == LONG_MIN) { */
64	if (errno == ERANGE) {
65	char message[256];
66	snprintf(message, 255, "Number is not in range of 'long int': %s", nptr);
67	errno=EINVAL;
68	if(warn)
69	PRINTWARNING(message);
70	else{
71	PRINTERROR(message);
72	exit(EXIT_FAILURE);
73	}
74	}
75
76	return number;
77
78	}
79
80	int main(int argc, char * argv[])
81	{
82
83	if (argc == 1) {
84	PRINTERROR("No arguments given.");
85	exit(EXIT_FAILURE);
86	}
87
88	/* (3) range mode */
89	if (argc > 2) {
90	long int i, j;
91	i = convert_number(argv[1],FALSE);
92	j = convert_number(argv[2],FALSE);
93	for (i; i< j; i++) {
94	PRINTPRIME(i);
95	}
96
97	/* other modes */
98	} else {
99	int err;
100	/* try to open file for reading */
101	FILE * fp = fopen(argv[1], "r");
102	err=errno;
103	errno=0;
104	/* (1) test-single-number mode: first argument is not a filename */
105	if (fp == NULL) {
106	long int number = convert_number(argv[1],TRUE);
107	if(errno){
108	fprintf(stderr, "%s: %s\n", argv[1], strerror(err));
109	return -1;
110	}
111	PRINTPRIME(number);
112
113	/* (2) file mode: read numbers from file */
114	} else {
115	char line[MAX_LINE_LENGTH + 1];
116	long int number;
117	int line_length;
118	long int line_no = 0;
119	while (fgets(line, MAX_LINE_LENGTH + 1, fp)) {
120
121	/* count line number (for warnings) */
122	line_no++;
123
124	line_length = strlen(line);
125
126	/* skip empty lines */
127	if (strlen(line) < 2) continue;
128
129	/* line handling: policy = skip exceeding lines */
130
131	/* line exceeds max length */
132	if (line_length == MAX_LINE_LENGTH && line[line_length-1] != '\n') {
133	char message[254];
134	snprintf(message, 256, "Line too long (max %i chars) in line number: %i", MAX_LINE_LENGTH, line_no);
135	PRINTWARNING(message);
136
137	/* eat all characters until newline or EOF */
138	while (1) {
139	int charcode = fgetc(fp);
140	if (charcode == 10 \|\| charcode == EOF) break;
141	}
142
143	/* skip this line from prime calculation */
144	continue;
145	}
146
147	/* if last char is newline, strip it */
148	if (line[line_length-1] == '\n') {
149	line[line_length-1] = '\0';
150	}
151
152	/* finally: prime number calculation and output */
153	number = convert_number(line,FALSE);
154	PRINTPRIME(number);
155
156	}
157	fclose(fp);
158	}
159	}
160	}
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